MC39693 Posted April 2, 2021 Share Posted April 2, 2021 New Pass design, VFET kit to be offered via lottery... check diyAudio. I’d love to build one of these. 2 1 Quote Link to comment Share on other sites More sharing options...
rhing Posted April 13, 2021 Share Posted April 13, 2021 If you don’t win either lottery, your best bet is to purchase some roughly matched NOS Tokin THF-51S SITs (VFETs) from eBay seller watanabetomoaki. Nelson Pass will have a design out that will use these SITs in a similar manner as his new single ended SIT amp using Sony 2SJ28 N-channel VFETs. Nelson Pass has mentioned that the Tokin SITs might be more capable of higher power output, but I am not clear how much more over the 8-10 watt capable Sony VFETs. Quote Link to comment Share on other sites More sharing options...
henry4841 Posted April 13, 2021 Share Posted April 13, 2021 Won the lottery, bought and paid for. Looking forward to building it. 1 2 Quote Link to comment Share on other sites More sharing options...
henry4841 Posted April 13, 2021 Share Posted April 13, 2021 The specifics can be found here. https://www.firstwatt.com/pdf/art_diy_sony_vfet_pt1.pdf I already have the PP version V-fet. This one is supposed to be a SS SE version of a triode tube amplifier. Looking forward to comparing it with my SE 300B. Quote Link to comment Share on other sites More sharing options...
LotsToLearnCW1 Posted April 26, 2021 Share Posted April 26, 2021 Any thoughts on the finished product? Can you compare to the 300B or any other first watt/SS? Quote Link to comment Share on other sites More sharing options...
Full Range Posted April 26, 2021 Share Posted April 26, 2021 I missed the deadline Here down under the start time was around 6 am and I got home about 1 am Just couldn’t wake up in time But I’m still in love with the M2 Quote Link to comment Share on other sites More sharing options...
henry4841 Posted September 26, 2021 Share Posted September 26, 2021 Finally built the SE V-fet I won on the lottery. Health problems prevented me from building it sooner. Went together smoothly without any problems on start up. Need some hours on it before I can call it a successful build though. Not expecting any problems but one can never tell. Very short listening period and first impressions are positive. Sound very much like a really good SE tube amplifier of which I have a number of. 3 2 Quote Link to comment Share on other sites More sharing options...
MC39693 Posted September 26, 2021 Author Share Posted September 26, 2021 @henry4841Fantastic! Quote Link to comment Share on other sites More sharing options...
henry4841 Posted September 26, 2021 Share Posted September 26, 2021 This is an interesting amp from Nelson Pass. The first to use a switching power supply for voltage with a input transformer and a large electrolytic capacitor on the output, sound goes through. Throwback to the old receivers and amplifiers of yesterday. Info with schematic can be found here for those that are interested in these kind of things. https://firstwatt.com/pdf/art_diy_sony_vfet_pt1.pdf The end result is a SE tube sound with better numbers. Output is 10 watts so is perfect for our speakers. Quote Link to comment Share on other sites More sharing options...
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