Pass V-FET kits are here!

Forgot to post this a week ago when they arrived, but I managed to secure a couple of the Nelson Pass V-FET kits which I am quite excited about.

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 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 opportunity. I was lucky enough to register my interest early on and so managed to secure a couple of kits to keep me busy on those long Scandinavian winter nights when they come around 😀

There’s a big discussion thread on diyaudio and also an article on the FirstWatt website about the design, in addition to the information in Nelsons previous articles on SITs (also on the FW website). As usual, I don’t really need these and the class A heat is a bit impractical in a small apartment, but a limited-edition amplifier kit with unobtanium transistors that was developed by Nelson Pass himself was an opportunity I simply could not pass up (pardon the stupid pun 🙂 ).

The Firstwatt F5 is still one of the best amplifiers I’ve heard in my system so I have very high expectations for this new design. The lower power of the VFET could be an issue, but I’ll have to build it and try I guess – with my current speakers it should be OK and if not, I can always get a pair of very inefficient planar magnetic headphones instead :D.

vfetpcb-1

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3 Responses to Pass V-FET kits are here!

  1. Christopher Tan says:

    Go active with your speakers, you can then use SIT on the highs and F5 in the bass? 😛

    • theslowdiyer says:

      Have been thinking about something like that, however my current speakers are single-wire only. I will definitely try the SIT on my old Elacs as well, and there’s a further option as well:

      I have a mysterious infatuation with PA coax-drivers that I need to indulge at some point and they are definitely efficient enough for a 10W amp 😉

  2. Pingback: VFET progress… | theslowdiyer

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