first watt sit diy First Watt SIT-3 for sale. DIY. The First Watt F4 is a classic Nelson Pass/First Watt design with JFET inputs and MOS-FET outputs. 18 watts a channel into 8 ohms, a high-ish output impedance of . Pass has been supportive of the DIY audio community by way of published articles (notably in The Audio Amateur) as well as providing schematics for out-of-production models on the Pass Labs site, and more recently for the First Watt site. 5 dB @ 10 Hz, 200 KHz; Noise: <100 uV unweighted, 20-20 KHz Home » Main » Amplifiers » Solid State » First Watt F5: Images 1 to 54 of 54 : f5 with rebuild ps: User: Attila I: Date: Sun March 8, 2015 : f5 with rebuild ps In this week's featured review, Terry London auditions the XA25 amplifier from Pass Labs. With our DIY packet, you just need to do 4 easy steps: First Watt amplifiers are routinely compared with tube amplifiers, although I make a point that they are not designed to mimic tubes as such. Close. on Audiogon, the High-end Audio Community Hello, anyone got any experience with First Watt SIT2 used as a headphone amplifier? I'm particularly interested in headphones like Utopia or HE1000v2, but any experience is welcomed. MSRP $4,00 0. The DIY BIAMP 6-24 kit is a stereo analog active biamp crossover circuit designed for high flexibility. When the Pass Labs XA25 Class A 25-watt (into 8 Ohms) stereo amplifier took on the role of being the entry level amplifier in the Pass Labs product line in 2017, it diverged from the aforementioned single-ended Pass Labs Aleph 3 and First Watt SIT-3 amplifiers, instead using a relatively simple push-pull Class A circuit. Nelson's long involvement in and appreciation for do-it-yourself (DIY) audio is described on the Pass DIY website. Threshold, eight for Adcom, forty for Pass Labs, fifteen for First Watt, and wrote something like eighty articles, mostly DIY projects. Been watching a couple interview videos of Nelson Pass. Chassis is the 4U 400mm Dissipante chassis from DIY Audio and HiFi-2000. Location: Leichhardt Designed by Pass Labs, First Watt, SIT-3 is the very latest example of single-ended / single-stage Class A amplifiers using the SIT (aka VFET) power transistor exclusive to First Watt. Please see: Used First Watt: First Watt SIT-3 stereo power amp. It retails for $3000, making it also the least expensive of the First Watt amplifier offerings. The PCB can house eight 10mm pitch leaded or snap-in type electrolytic capacitors( with maximum diameter of 35mm). I also have the combination of a First Watt SIT-3 and Magnepan . Somewhere below that, it was not usually heard - and above that it could be excessive. The SIT-3 is the 3rd and last of Nelson’s First Watt SIT amplifier designs. from First Watt. It has about 300 hours total use. But Nelson points to the distortion spectrum at 1 watt and 1kHz, and the 10dB ratio between the second and third harmonic as being contributing factors to the F7’s musicality. My F6 went pop again at the weekend and released more magic smoke. For an all rounder I'd go F6 If you decide to build then don't skimp on the power supply as that'll remain for every FW model you build. Cube Audio USA Distributor, Pass Labs and First Watt Dealer First Watt SIT-3. I also have a Pass Labs XA25 and First Watt F7. This provides plenty of heatsink for this circuit. A Bill Of Materials (BOM) lists the parts needed for this particular board. Project Author: Joined: 07 Jun 2008 2:12 am Posts: 972 Location: Houston, TX 10 years ago when First Watt began working with SIT circuits, they discovered that there was a consistent preference for this sort of characteristic in amplifiers over a range of distortion levels from about . I just sent off the PCB artwork for the 2SK77B SIT amps of which I will be making 20. Before you decide to listen to any First Watt amp check out which one would be suitable. First Watt is minimalist by design, its devoid of superfluous circuitry like output protection relays, standby modes, soft start, etc. SIT-1, the more refined of the two, uses a monoblock design and features an adjustable dial on the front panel that helps to optimize the performance of different loudspeakers. They refl ect the current consumption of the amplifi er, and when the amplifi er is operating, they don’t go down to zero like the meters on other amplifi ers. Now go build something! A thread about the various L'Amps is here: SIT Modeller. 0130% @ 1 watt, while THD on the left channel measured 0. Posted November 8, 2018. Saved by colin. DIY First Watt M2. The first offspring was the Aleph 0 followed by the 1 through 5. Search the Bluebook database on Audiogon, the High-end Audio Community First Watt for sale at Audiogon. 0135% @ 1 watt. firstwatt. share. First Watt SIT-3 Amplifier: Condition: Used. Here is an amazing amp built according to Nelson Pass' Sony vfet amplifier Part 2 article (check "articles" section of First Watt site for details). Black Faceplate only. Project Author: Joined: 07 Jun 2008 2:12 am Posts: 972 Location: Houston, TX I think we’ll be hearing a lot more about SIT transistors in the not too distant future, as I’ve read that First Watt has begun releasing amps into the wild for evaluation. MSRP $4000. You can still get them new, but don't wait around. Shipping now. SIT-3. " By the end of that review, the project had morphed to "the SIT-3 was recently revised as a result of marathon listening sessions. Posted: 25 Jun 2008 4:11 pm . I have Nelson Pass's First Watt SIT-3 power amplifier. . We make DIY simple by taking care of the design, paperwork, and electrical grid tie. It is a pure class A design using NOS Sony 2SK82 The First Watt SIT-3 stereo power amplifier. 5 Media Edition i7-8559U/32/512 running Roon ROCK (powered by a ZeroZone 19v/5A LPS) > Lumin U1 Mini (powered by an UpTone Audio JS-2 LPS) > UpTone Audio ISO Regen (powered by an Uptone Audio UltraCap LPS-1. Payment method: Cash, Paypal. Theres a dial on these that helps you tweak the sound signature to your taste. As you probably know they all use the same spec PSU. I have also heard that same friend's DIY build of the First Watt SIT amp. The First Watt F8 He used a wind-up Victrola sitting on a shelf directly in front of the cows, just below a framed reproduction of an Alpine landscape painting. Save first watt amplifier to get e-mail CRC Power Supply PCB PASS DIY F5 TURBO First Watt class A Power amp amplifiers Dust Cover Protector For First Watt SIT The First Watt SIT-3 Stereo Amplifier. Shortly after I starting working with the SIT-1's, a helpful diyAudio member alerted me to the existence of a supply of Sony VFETs sitting in Singapore. 收first watt j2、sit3等机型 First Watt SIT-3 w/ New Front Panel Style 4000 This is my first First Watt build and also my first solid state power amp. You may have to register before you can post: click the register link above to proceed. But today, Jon Ver Halen of Refined Audio was using the SIT-3 to drive Cube Audio's beautiful Nenuphar (Egyptian Lotus) full-range speakers. Shipping weight: 1. Want to learn more about SEO, digital marketing, conversion optimization, ecommerce? Or even how to generate more sales? Check out Neil Patel's marketing blog. 0 Audio Amplifier diy Kit with Volume Knob - TSA Selling my First Watt SIT-3 Class A amplifier, a unique amp created by the fertile mind of Nelson Pass. This thread is archived. Also, here is the updated part list featuring vendor and part #'s. If you have any AN Silver resistors of the values in the photo, that you have used as testers ( used ) and lying about feel free to PM me so I can exchange some However, I still rank Tokin Defisit, (same topology as SIT 3), my Nelson Pass push pull 20 watt Class A Sony VFET DIY type (slimmed down version of his Sony VFET monster amps that he only made in five pairs), and the vintage Yamaha B2 as best SS amps I have heard and owned. This is the bare PCB of a heavy duty DC power supply, designing for diy of class A power amplifiers in particular First Watt power amplifiers that requires dual rail. A bunch of 3000uF in parallel a In the realm of solid-state amplification, the pairing of the Wayne Colburn designed Pass Labs XP-12 line-preamplifier (review HERE), and the Nelson Pass designed First Watt SIT-3 stereo amplifier (review HERE), are an example of this performance paradigm that serves both music lovers and audiophiles equally well, something that can be quite difficult to accomplish. Among several others, I have reviewed two powerful amps from Pass Labs, the Class A XA160. 24 The First Watt SIT-3 is a rather amazing amplifier, although its usual 18 watts of stereo power into 8 Ohms is halved by my vintage Altec Corona 832A loudspeakers to 9 watts of stereo power into their 16 Ohm load - about like a 300B amplifier - which is still way more than enough power to driver the Corona's to live-like levels. **ALL newer First Watt amps have one LED light on face. The design uses CRC filtering configuration for good DC regulation. Share. report. The first few built have generated glowing listening reports, and once these are sold out that's it! While this model is somewhat more complicated than many of his amps, "Papa Pass" has helped builders by including test points on the circuit board, and writing detailed instructions. This activity ultimately morphed into First Watt in 2000 with commercial production as well as additional DIY designs. First Watt has introduced a new stereo amplifier, the F7--a two-stage push-pull JFET (input)/MOSFET (output), Class A design that uses fewer parts than any First Watt amplifier to date and offers First Watt SIT-3, mint condition, 6 months old. This is a class 'A', 25 watt push pull amplifier. I need to tidy up the wiring internally but otherwise it's complete. This has been an extremely reliable amp since first fire up over 6 months ago. First Watt F7 by myhui » November 19th, 2017, 8:50 pm Back in Hong Kong, in the 1980's, when Japanese audio electronics ruled the world, this activity of visiting each other's homes and bringing audio equipment for comparison is called 打 砲 台, which translates to "try to capture the castle that contains the canon", and that is just a . DIY First Watt M2. First Watt SIT 3極新淨 行貨 有單有盒2019年8月購入1手用家 升級出售價錢 HK$: 30000PM不留電話不回 First Watt SIT 3 ,Hiendy. If you would like to ask any questions, First Watt SIT 2 Stereo Amplifier Reviewed January 11, 2017 The greatest 20th Century inventor, Thomas Edison, had his New York-based Menlo Park Laboratory to experiment with all types of materials and designs to see what applications he could come up with to help improve the quality of living for the masses in his time era. Satisfaction Always Guaranteed. The F6 is single-stage push-pull complementary amplifier that uses an input transformer to drive the power Fets while also processing feedback control. New Article, the DIY Nutube Preamp. Typically, power amplifiers develop 25–30dB of voltage gain. Vendor First First Watt exists because Pass wants to explore a variety of amplifier-design strategies in what he thinks of as “neglected areas:” amplifiers that might not fit into the mainstream and are probably not appropriate for Pass Labs. DIY; Existing user? Sign In DIY ; SIT amp project Sign in to follow this . By way of response, Nelson agreed to send me a pair of amps — starting with the J2, a 25wpc (into 8ohms) solid state amp that “has a two-stage circuit that operates in pure single-ended Class A mode, with signal JFET devices forming the input stage and power JFET devices for the output The SIT-1 has a user adjustable “load line” adjustment which allows control of the second harmonic characteristic, the SIT-2 is a stereo version without the knob. More information People also Qnap HS-251+ NAS (powered by an HD-Plex 100w LPS) > Cirrus7 Nimbini v2. Final draft of DIY SONY VFET is posted. All original box, manual, power cord and packaging are present. However, before I tear down the system, to swap the Altecs for the West's, for the article about the Triode Lab 45 EVO SET integrated amplifier, I wanted to give the First Watt SIT-3 ( HERE ) and First Watt F8 (in for review) a quick listen with the Pass Labs XP-12 pre and XP-17 phono combo. It isn't going to baby your ears; it isn't going to swaddle you in warm blankies. I a ESS, of Heil fame. The First Watt F8 MSRP: $4,000 USD. Details about First Watt SIT-3 Amplifier See original listing. These SIT-1 transistors were employed to good effect in three First Watt amplifiers, imaginatively named the SIT-1, 2 and 3. The actual devices were bought as NOS (new old stock) by Nelson Pass himself and offered to the diyaudio community through the diyaudio store as a (more or less) one-off These are links to some of my project articles and other snippets. As occasionally happens in this forum, this thread has been hijacked to allow people to breast-beat regarding the various ideas regarding burn-in (and other things). Auburn, CA August 10, 2020 — The new First Watt F8 power amplifier has been created as an updated version of the earlier J2 amplifier, introduced in 2009. Hi Jack I really liked your review of the First Watt SIT-1 , I thought it was so good that I would like to purchase a pair of the First Watt SIT-1`s or even a First Watt SIT-2 for myself , do you know anyone who has a used pair for sale , Nelson Pass has discontinued production of them ( Ran out of the SIT parts from the large lot he purchased ) . diyaudio. The serial numbers are consecutive 945 and 946. It was a fun build - challenging at time’s as the instructions aren’t laid out as simply as a kit build, the advantage being that I learned a lot on the way. Like them, the new SIT-3 uses a Static Induction Transistor (VFET) in the power stage of a simple no-feedback amplifier. However, as with the other FW amps there is a twist here, namely that the F4 has no voltage gain. 23 comments. These SIT-1 transistors were employed to good effect in three First Watt amplifiers, imaginatively named the SIT-1, 2 and 3. G Auburn, CA 95602 (530) 878-5350 firstwatt. It was purchased in November/December of 2019 locally and has sat on my rack's second shelf ever since. The First Watt J2 makes 20dB. 000. 5' X 12. First Watt J-2 power amp 120V, demo The amps on the floor were the truly remarkable $10k/pair SIT-1 mono blocks from First Watt. View Classified First Watt Pass Labs SIT-3 VFET 18w Class A Stereo Power Amplifier FirstWatt Lab Excellent condition First Watt SIT-3 in black. Seems like a decent chap. We are the premier destination for high end audio equipme Like all First Watt designs, the SIT 3 is a low-power fully Class A design, this one uses no feedback and it puts out just 18 watts per channel into 8 ohms, and 30 watt per channel into 4 ohms www. 2s were heavier on their feet. Download LX MINI simulation files for LT Spice and MicroCap New First Watt products will find their way to market this year, and to make way for them, I am announcing “Last Call” on several models – the SIT-1, SIT-2, F6, B4, and B1. I have a Mytek Brooklyn Bridge for streaming, though I prefer to play vinyl with my Mofi Ultradeck. New comments cannot be posted and votes It provides outstanding dynamics and a big, open soundstage that is simply intoxicating. Like other First Watt gear, it uses simple circuitry, is relatively low power (20W into 8 ohms, 30W into 4 ohms), and is relatively cost effective with a list price of $3000. Nelson Pass’ First Watt Introduces New SIT-3 Stereo Power Amplifier Posted on April 11, 2018 April 11, 2018 Author Jack 2 Comments 2018 AXPONA, April 13, 2018 — The successor to First Watt’s legendary SIT-1 and SIT-2 amplifiers is now going into production. Always been a little curious of his First Watt amps, like the F6 for example. Featuring 12 discrete Jfet buffer circuits operated without negative feedback, it offers 16 continuously adjustable filter elements in two low-pass and two high-pass filters with slopes of 6, 12, 18, or 24 dB per oct Pricing and availability of that part remain to be seen. That also echoes my experience with XA25 and F7- Pass Labs makes extremely quiet speaker amps, and are a great match for Each channel is just 8 watts, but they're very good watts. Upgraded Pass Labs First Watt F5 - DIY 900 900 USD USD. They sound even better bi-amped with an active crossover. The article to First Watt Pass Labs Pass DIY Forum Linear Audio Burning Amp Fest audioXpress diyAudio Zen Mod Blog. SIT-1s are designed and built by Nelson Pass. First Watt First Watt J2 Power Amplifier Pass SIT Static Induction Transistor (SIT) single-ended power 30W stereo JFET amplifier. 99% Upvoted. Harold played the same Gustav Mahler symphony every day. First Name:Steve. $70 US. 5 inches, weight is 37 pounds. On DIY audio, some of them are currently building single ended 50 watt SIT amps using the Tokin devices. The First Watt SIT-1 mono block amplifiers are famous, due in no small part to the effusive praise heaped upon them by 6moons . 00 A unique chance to get a World Class Power Amplifier- the First Watt F6 - a subsidiary company by Nelson Pass, of Pass Labs amplifiers. The last piece of business there is a new front end. Absolute Audio Labs PCF 25 amp (improved First Watt F7 super clone) Recently, First Watt came out with their latest limited edition amp - the F7. 50 uV of noise. 18 Watt teljesítményhez 180. First, this amp does not sound like a world class 300B SET amp. Two amplifiers have just recently been released – the SIT-2 and SIT-1. This pure Class A stereo amplifier is rated at 25 watts RMS into eight ohms and 50 watts into four ohms. Does anyone have experience with a First Watt / Pass Labs SIT-2 driving La Scalas of Klipshorns? How does it compare with a SET amp? Thoughts about sound stage, bass development, etc? As it is a ten watt amp, how well does it drive horn speakers? This diyAudio Build Guide is all about the First Watt F-5 Class A Power Amplifier, one of the most popular amplifiers built in the DIY world. 11/18/18. Now that you have built one First Watt clone (since we all like to spend other people's money on this forum), if, or should I say when, you are up for a "different" build, I would suggest the Aleph J in order to sample a First Watt single-ended class-A two stage design that will match up very nicely to a larger variety of speakers as opposed to one of the other more esoteric single-ended The First Watt SIT-3 proved to be resolving, articulate, and nuanced, with subtle gradations of timbral textures and dynamics in evidence, and provided a large sense of spaciousness, both in terms of the overall sense of acoustic space of the recording venue, but also with a very tangible reverberant acoustic space presented around each instrument being played. This thread is archived. Once 100 F6's were sold (at a retail of $3500) Nelson sent his design to the DIY community. First Watt SIT-3 power amplifier Specifications. This time I'm going to carry out the mod recommended on DIYaudio,which entails replacing the zeners with a high precision LM329 version and changing a couple of resistors per channel. From the First Watt site, where Nelson Pass says it best: First Watt exists because I wanted to explore a variety of amplifier designs in what I think of as neglected areas - amplifiers that might not fit into the mainstream and are probably not appropriate to my more commercial enterprise, Pass Labs. Except for the three-legged SIT, the eight things that look like transistors on the sink are 100-watt Vishay resistors which set the bias (the SIT-2 is biased by a FET current source). The subject of this review is the unique First Watt SIT 2 amplifier, which retails for $5,000. Both amps sound big and musical with a clean presentation and the sweetness of tubes. Want to learn more about SEO, digital marketing, conversion optimization, ecommerce? Or even how to generate more sales? Check out Neil Patel's marketing blog. More gain than some of us need or want. The J2 and F7 remain in production. Eladó egy kifogástalan új állapotú karc mentes eredeti gyári First Watt SIT-3 végerősítő. You can do better than this still, but given the current state of transistor art you will probably have to make the amplifier more complicated; adding more parts, more gain stages, active current sources, feedback, and whatnot. Just bought the PCBs for this and the power supply. One pair of First Watt SIT-1 mono amplifiers. SIT-3 Specifications Maximum output 18 Watts @ 8 Ohms, 30 watts @ 4 Ohms I think DIY Power Amp based on the design released by this series for myself use will not involve infringement of intellectual property rights. He said the music and the mountain scene relaxed the cows, causing them to give better milk. The SIT-3 is well on it's way to being considered a modern classic, those of you looking at this post will know exactly what a rare beast this is, it will only become more so as the years pass. Subscribe via Email! I think the Pass First Watt SIT 1 through 3 are more comparable (than F7/8) to the 300b but still will not sound the same. The amp is 18 x 17 x 7. First Watt. I mean, so long as you can get by with only 10 watts, and with 100dB speakers, 10 watts is plenty. 7 V; Damping Factor: 38 @ 8 OHMS; Output power 8 ohms: 25 watts @ 1% THD, 1KHz ; Output power 4 ohms: 13 watts @ 1% THD, 1KHz ; Frequency response: -0. If Nelson's design philosophy conflicts with your 'green' sensibilities then the decision has been made for you, there's no need to deride an amplifier you haven't even heard. Now numbering fourteen with each having a unique design and very limited production. First Watt F-7 power amp 120V, demo: Demo, new condition, all factory accessories, three years transferable warranty, new factory boxing, Satisfaction Guaranteed. Introduction. I read the 12v battery will discharge but I can always charge it when I get back. 00cm. Amplifier: First Watt SIT-1 Speaking of “being out of scope”, there are those First Watt monos, but it the spirit of giving, I thought I’d just include them here as a sort of aside. 7's. 5, Decware Zen TorII MK4, Line Magnetic 845 Premium, Raven Reflection MK2 Pre-Amps: Luxman 900U, ARC MP-1 Multi-Channel, Conrad Johnson Met-1 Multi-Channel Disc Spinners: Ayre DX5, Oppo 105/205 DIY VFET/SIT amp for sale. I know there was a recent thread on a First Watt DYI build. Posted by 1 year ago. hide. That amp, and others I've heard from First Watt, are so much better than most other solid state amps if you have the right kind of speakers (I do, and my friend runs 105 db/w speakers). Leaving Class A — Nelson Pass / 2008 The meters on our amplifi ers are different. The J2 is a stereo power amplifier rated at 25 watts per channel into 8 ohms, and 13 watts into 4 ohms. DIY First Watt M2. 120V. Papa Pass says this design is the simplest First Watt two-channel amp of them all, with a two-stage output whose final output stage consists of a single pair of MOSFETs. It and the SIT 1 are the only amplifiers in the world that use (Silicon Carbide) Static Induction transistors in a SET solid-state design. html. The 2SK77B is a 300-watt VFET and makes for a very nice SE Class A no-feedback amplifier along the lines of the SIT-1 but with 50 watts and about twice the damping factor. 36 (kg) Calculate Shipping. I am using a ~15 year old VAC (Valve Amplification Company) Standard Preamplifier using NOS Telefunken 12AU7 and 12AX7 tubes for the 2 stages. Shortly after I starting working with the SIT-1's, a helpful diyAudio member alerted me to the existence of a supply of Sony VFETs sitting in Singapore. Shortly after I starting working with the SIT-1's, a helpful diyAudio member alerted me to the existence of a supply of Sony VFETs sitting in Singapore. First Watt has always had a philosophy of ‘less is more’, and the First Watt F7 is a refinement- a further simplification- of arguably Nelson Pass’s most popular amp, the First Watt F5. Lots more to come on the First Watt F8! As always, thanks for stopping by, and may the tone be with you! × First Watt B1 clone I returned to DIY electronics in 2009 after a 20 year pause by building a few kits to get in shape. With oddball chara At retail prices, the First Watt amps are reasonably priced, but if you are a DIY sort of guy, they would be an affordable way to have some of the best amplification available, so long as they are compatible with the sensitivity of your speakers. 5') to that of Herb Reichert, so I knew that I would not need as much power. A friend of mine, using First Watt schematics, built one of their SIT amps and it is a very good solid state amp. DIY First Watt F1 Clone Build. 55dBW), 30Wpc into 4 ohms (11. This is a class 'A', 25 watt push pull amplifier. 02% ; Input Impedance: 100 Kohm ; Gain: 15 dB ; Input Sensitivity (1 watt): 0. Everyone knows I think the First Watt SIT-3 amplifier ($4000) is one of the most fully resolving amplifiers I've ever used. On top of having only four transistors and four resistors in the circuit- the bare minimum for a circuit of this type- it also employs a rare combination Misho Myronov Wooden amp, First Watt SIT-3 (x 2 - one as backup), Job 250 Monos, NuForce STA200, AkitikA GT-102 amp, ASL Wave monos, Dennis Had 45 monos. Condition is very good as noted in pictures. I am using a ~15 year old VAC (Valve Amplification Company) Standard Preamplifier using NOS Telefunken 12AU7 and 12AX7 tubes for the 2 stages. This uses a unique SIT transistor that is available only to First Watt. The J2, SIT-1, and SIT-2 all have specified power consumptions of 200 watts. My first commercial amplifier was the Threshold 800A. com. At 1 watt, the distortion here is about 30 dB lower than our first effort. 5. Here is a picture of First Watt's SIT device: In the previous circuit, it delivers 18 dB gain into an 8 ohm load with the following distortion curve: The bandwidth extends to about -3DB at 200 kHz with a 600 ohm source impedance, and with a 50 ohm source, it makes a decent little AM transmitter. US Audio Mart 2021-03-19. First Watt Sit 2 for sale. Listening with Harbeth Monitor 30. At least 10 db more. If you can put up Christmas lights, you can install solar. Thanks again to Nelson Pass and friends at the Pass Labs Forum on diyAudio. Alternatively I can start paralleling SIT-1s but realistically First Watt is not likely to go beyond about 25 watts. Now to add to the intrigue of the popularity of the SIT-1 and SIT-2, Nelson has for 2018 released his third version of an amplifier based on his custom run of SemiSouth static induction transistors, the very innovative and creatively designed First Watt SIT-3. Shortly after I starting working with the SIT-1's, a helpful diyAudio member alerted me to the existence of a supply of Sony VFETs sitting in Singapore. I'd suggest starting another thread, possibly calling it "nelson pass f3 first watt amp (the second)" - or asking the moderators to move the other stuff to a different thread. The DIY F6 had already emulated them to a high degree quite as though it were directly imprinted by the SIT precedents. Absolute Audio Labs PCF 25 amp (improved First Watt F7 super clone) RME Audio ADI-2 DAC FS, ModWright Ultimate Sony XA-5400ES. Ended: Dec 31, 2020. The F7 employs both negative voltage and positive current feedback, which reportedly helps it to better adjust to variable and reactive speaker loads, creating a circuit that behaves like a well-choreographed dance between speaker First step is to create the power supply. First Watt SIT-3. Has a correction on part list quantity for 10nF capacitor. Review systems. The successor to First Watt’s SIT-1 and SIT-2 amplifiers is now going into production. . Second, if you like the sound of 300B SET amps you will more than likely like these amps very much. It is preceded by the successful SIT-1 and SIT-2 and very much follows their technical philosophy and construction. Claimed to deliver 25Wpc into 8 ohms (or 13Wpc into 4 ohms), the J2 has a damping factor of 20 at 8 ohms. And I'm also interested in having experience re direct driving the SIT2 with a DAC or using a preamplifier Misho Myronov Wooden amp, First Watt SIT-3 (x 2 - one as backup), Job 250 Monos, NuForce STA200, AkitikA GT-102 amp, ASL Wave monos, Dennis Had 45 monos. First Watt’s aim is to provide high performance amplificaiton products that don’t fit into the traditional commercial product line-up, such as amplifiers with under 25 wpc output. Because of the high input capacitance of the 2SK180’s and the gain of this circuit, we have to pull out all the stops to get our 75W beast to make audio bandwidth. This blog is for me to keep track of my progress. 200K input impedance. . Here is an amazing amp built according to Nelson Pass' Sony vfet amplifier Part 2 article (check "articles" section of First Watt site for details). It is preceded by the successful SIT-1 and SIT-2 and very much follows their technical philosophy and construction. 6 FAOW Variation #2 Build This Mofo! Nelson Pass BAF 2015 Slides (courtesy of the master … FS: First Watt F5 DIY Clone If this is your first visit, be sure to check out the FAQ by clicking the link above. e. g. First Watt clone parts kits Sort by Featured Best Selling Alphabetically, A-Z Alphabetically, Z-A Price, low to high Price, high to low Date, new to old Date, old to new Filters First Watt J2 stereo power amp, 120V. The new Static Induction Transistor SIT-2 stereo amplifier from Pass' First Watt company is a plain dark-gray box. Sold Out. I need to tidy up the wiring internally but otherwise it's complete. In stock now. He often interacts directly (and somewhat tersely) with audio hobbyists. These amplifiers share some of the characteristics of the better tube products in that they have simple circuits with minimal or no feedback and emphasize performance of individual gain devices. The SIT-1 and SIT-2 used a single-ended circuit that has only one active device per channel; that is one SIT transistor. US Audio Mart 2021-03-27. 250 of these amplifiers will be made in a limited production run, and then they will be out of parts. com for the best high performance audio videos on the Internet. ** New & Demo. I’ve been lucky enough to demo these amps and they’re hard to beat. But the bigger Harbeth Monitor 30. to/3bqocYo💎💎💎 Speakers reviewed and recommend My experience suggests that choosing a speaker with high impedance and a benign phase characteristic is more important than high sensitivity. First Watt Aleph J. The First Watt Aleph J is a direct descendant of the Volksamp Aleph 30, itself a descendant of the Pass Labs Aleph 3. This one of the very few New In Box still available! Herb Reichert from Stereophile stated that when matched with the right speaker, this is one The First Watt SIT-3 seemed to preserve the geometry of the original harmonic relationships better than any amp I can remember, and thus made instruments sound quite real. The most powerful First Watt amplifier is 25 Watts, and the least powerful is about five Watts. , Lockheed Martin) that cranks out the high performance jet fighters that all the hot-shot guys fly, then First Watt would more resemble the top-secret branch that puts out the occasional special purpose plane built to accomplish a very specific and highly classified mission like the U2. For sale is a CLONE of the First Watt J2 using "Long and Skinny" boards. With oddball chara These SIT-1 transistors were employed to good effect in three First Watt amplifiers, imaginatively named the SIT-1, 2 and 3. Stereophile reviewed the $2,300 Aleph 3 in 1997, two years after it came out. To quote These SIT-1 transistors were employed to good effect in three First Watt amplifiers, imaginatively named the SIT-1, 2 and 3. 23 comments. $2595. I'm very impressed with it, so much so that it is now my main amp with an Elekit TU-8500 valve pre. It did not take me long to settle on enjoyment of big power. Note the First Watt SIT-3 in Nelson's home listening room in the photo above. 7s. In order to take 120V AC and turn it into DC you need the big toroidal Transformer and the bridge rectifiers from there it feed the Power Supply board which takes the DC and stores some and smooths out the DC signal. With First Watt, he is experimenting with less mainstream design, less powerful and simpler amps, but don’t think that means for a minute that they produce less music. I have built the WHAMMY headphone amp which I plan to use as the pre for this, alternately I have a Meridian 101 pre. 5, and the Class A/B X600. save. The total harmonic distortion has been trimmed to 0. The Mytek serves as the phono stage (69dB gain for MM?), and I don't use a preamp; the Brooklyn is connected directly to the First Watt. Total build cost was about £450 with the case and transformer accounting for a large percentage. Towards that end in 1998 Nelson founded Pass DIY and First Watt to explore novel amplifier designs in an environment unfettered by commercial concerns. $3,400. " If you are unfamiliar with First Watt's product spectrum and with the underlying philosophy of its progenitor, Nelson Pass, I strongly suggest that you visit the First Watt website for an orientation. The First Watt F7 power amplifier. 26 ohms. The All of the First Watt amplifiers feature minimalist circuits with little or no feedback and are highly innovative design approaches to Class A circuits, using either metal-oxide-semiconductor field-effect transistors (MOSFET), junction gate field-effect transistors (JFET), or static induction transistors (SIT), and with some of the designs being current sources instead of the more usual voltage sources, often being single-ended, and sometimes having no voltage gain at all! "btw, I haven't taken a photo of production but here's the pic I took of the first proto SIT-1. Pass’ many offerings of do-it-yourself projects and a great many articles supporting the do-it-yourself community. Rated 7/10 as it is DIY. I stayed in this room for over half an hour I was so captivated by the sound from both amps. 2 x 8 Watt Class D Bluetooth 4. Its meant to be left on continuously for best sonic performance. Achievement Unlocked: 75 Watt Class A Zero Feedback SIT Circlotron. Having completed a modified First Watt B1 Buffer Pre project recently I can highly recommend it. Steve Guttenberg/CNET All of that came into focus as I spent time with the First Watt F7 20-watt-per-channel stereo power amplifier, designed by Nelson Pass. 01% to 1%. Along the way I designed about thirty products for. First Watt amplifiers are routinely compared with tube amplifiers, although I make a point that they are not designed to mimic tubes as such. First Watt (Pass) SIT-3 - available in Paris 4500 4500 USD USD. New Posts about first watt written by theslowdiyer. DIY Amp Camp Amp. 130. 2 loudspeakers Harbeth's little P3ESRs danced gingerly with the SIT-3. Wasn't the final F6 predestined to do that even more? If so, it'd pull that stunt for less coin than the exotic static-induction transistors yet produce significantly more useful power (50 Mosfets watts into 4 ohms versus 8 I use a Pass DIY type 20 watt push pull class A VFET amp with Stax headphones/custom transformer and it is basically about the best headphone sound I have ever heard bar none, including 009/007 with Blue Hawaii (which sound I have never really liked that much when heard at shows). The F1 is a transconductance “current” amplifier with low noise, balanced inputs, 10 watts of power, and dissipates 100 watts. A Few Technical Details While it isn't easy to make a transistor behave like a triode, the payoff is substantial when it comes to minimalistic single-ended designs. Posted: 23 Jun 2008 7:39 pm . $750 net to me. The First Watt series offers a simpler, purer, less powerful solution to the Pass Labs family of amp designs. Absolute Audio Labs PCF 25 amp (improved First Watt F7 super clone) RME Audio ADI-2 DAC FS, ModWright Ultimate Sony XA-5400ES. I used blind evaluations for the SIT-1, the First Watt amplifier, and on the front panel there was a knob that allowed adjustment of this characteristic in distortion amplitude and phase. 135 points. This is a First Watt SIT-3 class A amplifier, a superb sounding Nelson Pass amplifier. First Watt SIT-3 stereo power amp. The Aleph series was given birth by Nelson Pass and Pass Labs back in 1991. Think of it this way: If you are running your volume control down around 9 Unfortunately, there was only one production run of this transistor, commissioned by First Watt and made by SemiSouth, unfortunately now defunct. Along the way I designed about thirty products for. It retains their desired second harmonic character with even fewer higher order harmonic components. First Watt SIT 3 Stereo Power Amplifier for sale. share. Nelson's description of First Watt's target listeners is, "If you have efficient loudspeakers, listen at reasonable levels and are obsessed about subjective performance, then you probably have come to the right place. I found that listeners tended to cluster on the same setting, which was made the center of the adjustment meter. in 1975, and the very latest are the XA25 from Pass Labs and the SIT-3. 5 Preamplifiers: Lamm Audio L2. Nelson also used these as the sole single-ended output devices in his now discontinued First Watt SIT-1 and SIT-2 models. Inputs: 1 pair single-ended (RCA). SIT is short for static induction transistor (i. Concise SIT Model from Linear Audio Vol. I'm new to the audiophile world and recently purchased a First Watt SIT-3 with Magnepan . Anyone ever built or listened to the diy First Watt amps (F5, F4, Aleph) as Im considering this as an option for a power amp, seems like a lot of amp for the build cost and class a should work nicely with my speakers. Like them, the new SIT-3 uses a Static Induction Transistor (AKA VFET) in the power stage of a simple no-feedback amplifier. My first commercial amplifier was the Threshold 800A. 00. The result is a very transparent sound (given good ancillaries of course). I'd love to try the SIT-3 with my speakers. They are single-ended, Class A, zero feedback transistor amps (one per channel). MSRP $4000. Item #649467782Info: FirstWatt F6 DIY kit. In my case I also have a similar sized listening room (10. The 2 watt non magnetics sound considerably better than the 1 watt versions and the 2 watt silver versions remarkably better again. Shop all First Watt. Price: US $3,495. The SIT is a special and unique output device, as it was designed specifically for audio reproduction to capitalize on its characteristic triode-like behavior. The SIT is a custom part that Nelson Pass commissioned from the now-defunct SemiSouth Company, and he says it has the character of a tube triode. Having had previous experience with the following: Electrocompaniet EC4. It seems most audiophiles enter the hobby already well upward from the bottom steps of power by using either a receiver with at least 100Wpc or separates at the same, or higher, specification. Please visit http://www. Shortly after I starting working with the SIT-1's, a helpful diyAudio member alerted me to the existence of a supply of Sony VFETs sitting in Singapore. Pre-Owned. Cube Audio Nenuphar Speakers, First Watt SIT-3 Amp This room was incredible. Far more probable is that you will see some of these things embedded in the next generation of Pass Labs. First Watt Pass Labs Pass DIY Forum Linear Audio Burning Amp Fest audioXpress diyAudio Zen Mod Blog. In his First Watt “laboratory” with the SIT 2, Nelson Pass has created a unique and special amplifier. It replaced a Copland CSA-29. It ran for many days without issue. I am looking to upgrade the preamp and am considering the Passlab XP-12 or the Linear Tube Au For sale is a recently built First Watt DIY Aleph J clone. I have built 7 of the Nelson Pass DIY amplifier offerings over the years, and am thinning my collection to what works the best with my present system setup. Black Faceplate only. It was time to close up the chassis and take it back home to enjoy. 00cm x 20. SIT-2 is a stereo version of the same amplifier. These SIT-1 transistors were employed to good effect in three First Watt amplifiers, imaginatively named the SIT-1, 2 and 3. µF energia tároló kapacitást rendeltek hozzá. Ontheone , Aug 9, 2020 The First Watt Model B1 Buffer Preamplifier Operating at the speed limit! Review By Dick Olsher First Watt's latest DIY offering, the B1 buffer stage, is described by Nelson Pass as "a no-feedback JFET buffer that offers ultra low distortion and noise with ultra wide bandwidth. In fact Nelson's DIY endeavors are called "First Watt" because in his own words "The first watt is the most important watt". Deconstructing the First Watt DIY power supply - Part 2 Transform yourself! To recap part 1: A theoretical First Watt F6 amplifier with a 23V power supply that, in a worst-case scenario, will be asked to drive 100 watts into 2 ohms, requiring current of 7 amps. avshowrooms. Price includes shipping within CONUS and PP fee. As you can see above, the F3 has the lowest distortion and one of the lowest noise levels of all the First Watt designs to this day. com/forums/pass-labs/321925-diyaudio-watt-m2x. . save. DIY ACA class A amplifier with linear power supply. I am looking to upgrade the preamp and am considering the Passlab XP-12 or the Linear Tube Audio MicroZotl MZ3 preamp. There were only 250 of these amps made by Nelson Pass and they are highly sought after. Archived. Page 1 of 5 1 2 3 4 5 Next Also on Positive Feedback FIRST WATT 13395 New Airport Road, Ste. Total build cost was about £450 with the case and transformer accounting for a large percentage. For a comparison, the SIT-3 has 20x the harmonic distortion as the F3--something that I'd pay a little attention to in the probably more audible application driving the Jubilee compression driver. That was a really nice sounding amp too, but, I suspect it puts out even more heat than the J2. Power output: 18Wpc into 8 ohms (12. It is a pure class A design using NOS Sony 2SK82 Save first watt amplifier to get e-mail CRC Power Supply PCB PASS DIY F5 TURBO First Watt class A Power amp amplifiers Dust Cover Protector For First Watt SIT Save first watt to get e-mail alerts and Power supply PCB for DIY First Watt class A Power amplifiers ! first Watt sit 1, Canton SLS 790 DC. PassDIY. I wanted to own those speakers. The amp has enough power for medium to high efficiency speakers at normal listening levels. Shipping Dimension: 40. 0 Audio Amplifier diy Kit with Volume Knob - TSA 5 out of 5 stars (2) 2 product ratings - 2 x 8 Watt Class D Bluetooth 4. Lower price. to/3emOj4iGrado SR-80e: https://amzn. I plugged the amp into my system consisting of an Audio Research vacuum tube phono stage, an Audio Research vacuum tube line stage and a pair of KEF LS50 monitors. The SIT-1 and 2 operated the SIT device in Common Source Mode, which delivers both voltage and current gain. 👉👉👉Headphones: Meze 99 Classics: https://amzn. It is preceded by the successful SIT-1 and SIT-2 and very much follows their technical philosophy and construction. As I alluded to, the 16 Ohm vintage Altec 832A Corona loudspeakers are just the sort of loudspeakers the First Watt SIT-3 was made for, with its 10 watts into 16 Ohms being more power than I could ever reasonably use even on huge dynamics swings, or when playing music very loud. 5 V; Input Sensitivity (max output): 2. Same box as ever. Misho Myronov Wooden amp, First Watt SIT-3 (x 2 - one as backup), First Watt F7, Job 250 Monos, Valvet E2se, NuForce STA200, AkitikA GT-102 amp, ASL Wave monos, Dennis Had 45 monos. DIY ACA class A amplifier with linear power supply. com showcases Mr. If you can get on your roof, use a power drill, and plug in a cord, you can install with Project Solar. The gentleman was kind enough to switch between both amps for me. 2018 AXPONA, April 13, 2018 — The successor to First Watt’s legendary SIT-1 and SIT-2 amplifiers is now going into production. US Audio Mart Hello, I have Nelson Passs First Watt SIT-3 power amplifier. With the review of the First Watt J2 JFET Amplifier and B1 Buffer Amp, it is time to descend. It's going to tell how it is, and it's going to be insistent about it. This is the finished product of DIY: It is based on the design of FirstWatt F6 , and I made some efforts in the selection of components during the production process. Hi Jack I really liked your review of the First Watt SIT-1 , I thought it was so good that I would like to purchase a pair of the First Watt SIT-1`s or even a First Watt SIT-2 for myself , do you know anyone who has a used pair for sale , Nelson Pass has discontinued production of them ( Ran out of the SIT parts from the large lot he purchased ) . 18. The First Watt B1 Buffer Preamp Nelson Pass, June 2008 Side A So here we are in the New Millennium, and thanks to Tom Holman and THX we’ve got lots of gain in our electronics. Post subject: Re: DIY First Watt F5 Current Source Amplifier. Stereo Amplifier Hifi Audio Audiophile Techno Speakers Electronics Education Projects Vintage. For sale is this DIY F5 First Watt / Pass beast of an amp. No feedback of course. Sure, it has signature Pass cooling fins sticking out at an angle like Batman's car, but small, bright blue LED eyes replace the famous big, blue Pass meter. (In the case of the monoblock SIT-1 that would be per monoblock). The amplifier doesn't look monstrously powerful. Post subject: DIY First Watt F5 Current Source Amplifier. Subscribe via Email! The diyAudio First Watt M2x: Pass Labs 4,793: Now MEPER: Class A in itself benificial? Pass Labs 94: 1 min: scottjoplin “New Original” Alternate First Watt F5 Tribute Power Supply PCB: Pass Labs 24: 2 mins: codyt: Is this SIT Circuit going to work? Pass Labs 29: 2 mins: Zen Mod: PhiDAC hex kits with pre-built filters: Vndr Bazaar 248: 3 In short, this is a low-power class A amplifier based on some complementary Sony V-FET (SIT) transistors that have been out of production more or less since before I was born. The review on the CNET Audiophili I built this little class A ACA amp (Amp Camp Amp) designed by Nelson Pass from First Watt with 120VA toroidal transformer. Updated article for the DIY LXmini crossover. The group buy is based on the boards as imaged below. This one of the very few New In Box still available! The Source pin is grounded. $8. 8, Tom Evans Vibe, Meridian 502, Chord Prima etc. Word is from the first completed amps they sound as good as the Defisit/SIT-3 types with more power. I'll be excited to hear the new First Watt F8, and compare it to the First Watt SIT-3 and Pass Labs XA25 power amplifiers, which are both remarkable power amplifiers in their own right. 6/27/2016 The SIT-2 is the first of a new generation of power amplifiers using Static Induction Transistors (SIT) in single-stage, single-ended Class A circuits delivering superlative sound without feedback or degeneration. a VFET), which is what the First Watt SIT-3 uses in its power stage. Pass Labs engineers and manufactures the finest Class A and Class A/B audio products in the world. Just wondering if anyone else has tried it or even heard the Pass Labs M2 (this is an authorised clone). This thing is manly. 13 comments. However, as with the other FW amps there is a twist here, namely that the F4 has no voltage gain. First Watt's SIT-3 has more power, more damping factor and less distortion than the previous designs. Asking Price: CAD $ 190. Meanwhile, work continues. 1 Reference; Merrill Audio Christine Reference; The Horn Shoppe Truth The First Watt SIT 3 amp is blowing my mind, it's so good, but so different sounding than any other amp I've heard at home. 00. These amps are in excellent physical condition and perfect working condition. Most systems have an excess of gain so you may need less than you think. Find a great deal on products from First Watt. Outputs: five-way binding posts. I have another friend who has the SIT-2, and the background is pitch black with his Audeze headphones. LuminAria SIT Preamp. Cost is around £400 including case and all components for a F5 (25W into 8 ohms From the First Watt site, where Nelson Pass says it best: First Watt exists because I wanted to explore a variety of amplifier designs in what I think of as neglected areas - amplifiers that might not fit into the mainstream and are probably not appropriate to my more commercial enterprise, Pass Labs. Good luck with your build as it should sound sweet. 05% at 1 watt. hide. These amplifiers share some of the characteristics of the better tube products in that they have simple circuits with minimal or no feedback and emphasize performance of individual gain devices. ESS, of Heil fame. Tulajdonságai: zero negative feedback (ZeroNFB), pure Class-A single-ended módban. To do this a transformer able to meet the challenge is needed. Most of the SIT parts were used in the first two amplifier models, but nearly half were held for service and also this new design. Although the same enclosure is used by other First Watt models, it doesn’t look like a cheap DIY item; the faceplate is impressively thick, and the metalwork is all first-rate. Threshold, eight for Adcom, forty for Pass Labs, fifteen for First Watt, and wrote something like eighty articles, mostly DIY projects. "There is a key difference in the new SIT-3, which is that the Static Induction Transistor (SIT) that forms the heart of the circuit is operated in an entirely different mode, what is known as Common Drain Mode. Like the OP I also made this choice largely on the basis of the Herb Reichert and Steve Guttenberg reviews. I reviewed the SIT-3 with every speaker in my house, and I heard it in Nelson Pass's lab/studio, driving a pair of DIY speakers featuring 8" Cube Audio full-range drivers. Anyone heard First Watt am Personally I have an SIT-3 coming in for exclusive headphone use. First Watt clone parts kits Sort by Featured Best Selling Alphabetically, A-Z Alphabetically, Z-A Price, low to high Price, high to low Date, new to old Date, old to new Filters I reached out to Nelson Pass of First Watt this summer and asked the “what’s what with First Watt”. Amps: First Watt SIT-3, Pass XA25, Valvet E2 SE, LTA Ultralinear, LTA ZOTL40, ARC 150M, First Watt SIT-1 Mono's, ARC Ref75SE, Luxman M900U, Pass XA30. This is a First Watt SIT-3 class A amplifier, a superb sounding Nelson Pass amplifier. Perfect working condition. report. Description: Solid-state, class-A, stereo power amplifier with no feedback, using custom-made static induction transistors (SITs). 1/18/19. in 1975, and the very latest are the XA25 from Pass Labs and the SIT-3. The venerable First Watt SIT-3 is now available for your consideration. Followers 1 First Watt SIT-3 pricing information. Let me just start the review by saying two things. Like all First Watt designs, it is a relatively low power [25W/channel into 8-ohms] simple Class A circuit, designed with an unusually low parts count. Founded over 30-years ago, our products elevate your audio experience. For sale is a First Watt F4 clone I have personally built using the recommended signal boards from DIY audio and a generic bipolar power supply board. The SIT 2 is based on a Silicon Carbide (SIC) power JFET known as a Static Induction Transistor. The SIT-2 was shown this month at two audio shows in Japan. Product: First Watt SIT 3 Stereo Power Amplifier; SIT3; Black - ExcellentProduct SKU: 30957Serial Number: 5010Voltage: 120VCosmetic Description: 9/10 Excellent condition with no notable blemishes. Why? Because the 18Wpc SIT-3 is a unique and historically important design that can't be wired up to just any loudspeaker and then critiqued on the basis of its bass power, treble First Watt SIT-3 Stereo Amplifier 3950 3950 USD USD. This was my personal amp, but am selling my present amps due to speaker changes. First Watt (Pass) SIT-3 - available in Paris - SALE PENDING US Audio Mart $4,500 Mar 18, 2021 Bonanza Power supply PCB for DIY First Watt class A Power amplifiers ! The First Watt SIT-1 is a single-ended Class A monoblock power amplifier that uses a single transistor, no feedback, and no output transformer. Speakers KUDOS Super 20 ANAD M51 DAC "The SIT-3 is the very latest example of single-ended/single-stage class-A amplifiers using the SIT (aka VFET) power transistor exclusive to First Watt. from First Watt. The high input impedance of your SIT amp means don't sweat it! As to gain; how much do you need? Perhaps ask First Watt to express this value to you in a simple way ie x volts input = x watt output. 99% Upvoted. Vacuum Tube Amplifier . How long can my prius sit in storage? I'm going to boot camp and my car won't be driven for 3 - 6 months. The First Watt M2 requires 50V DC to run the audio boards. I will NEVER sell this amplifier - absolutely the best sounding amplifier I have ever heard. com is the First Watt company website containing product information and numerous articles by Nelson Pass — it’s great reading! www. Associated Equipment Speakers: Basszilla Platinum Edition Mk2 and OB3 DIY; Quad ESL-57; Innersound Isis Mk 3. 75dBW). com 影音俱樂部 Distortion @ 1 watt, 8 ohms: 0. Soft clipping at 75W. 00cm x 30. I'm not really any good at describing sounds. Although I recently built a new type of F5 amplifier, I haven’t completely abandoned the original F5 design 🙂 Hiding in one of my many boxes were a pair of half-finished F5 boards and some matching matching fan heatsinks that only needed the last bits of assembly and calibration. In the SIT-3, the voltage gain develops through an input stepup autoformer which gives about 12dB. This is made possible by the unique characteristic of First Watt's custom SIT devices, which combines a square-law input character with a low impedance output to form the only solid state gain device which behaves like a Triode tube. 240V. https://www. The devices SemiSouth delivered made their way into two First Watt power amplifiers, the SIT-1 and SIT-2, thus making audio history in the process. 18W/8Ohms, 30W/4Ohms. Nelson Pass’ First Watt Introduces New SIT-3 Stereo Power Amplifier Secrets April 11, 2018 018 AXPONA, April 13, 2018 — The successor to First Watt’s legendary SIT-1 and SIT-2 amplifiers is now going into production. DIY Is easier than you think. 23 Days Left. THD on the right channel measured 0. If Pass Labs is more akin to the major company (e. The dim bulbs glowing kinda bright because it’s only a 60W bulb I need to buy something bigger. The power supply is a mono supply, like the original First Watts. The F8 makes just 15dB, which is unusually low for a production amplifier. 2) > Metrum Acoustics Adagio NOS digital preamplifier + First Watt March 24, 2021 in Announcements // Qobuz Becomes First Hi-Res, 24-bit Streaming Service Available on Sonos March 18, 2021 in Announcements // Volti Audio introduces Lightning Razz, featuring a Fractal Burned Finish March 16, 2021 in Announcements // FOCAL Clear Mg Headphones Announced I am obliged to begin this review of First Watt's new stereo power amplifier, the SIT-3, with an explanation of how I believe a power amplifier should be reviewed. This is a good price for friends, and is a ton of amp for the $$$. Cube Audio USA Distributor, Pass Labs and First Watt Dealer. first watt sit diy