Tube DIY Asylum

WEll,

104.129.198.51

gusser

In Reply to: RE: opps..... posted by vinnie2 on August 29, 2017 at 11:47:43

You can build a class A amp with a single transistor or MOSFET output stage.
Single Ended Transistor?

Edits: 08/29/17

Follow Ups:

RE: WEll, - vinnie2 12:41:53 08/29/17 (5)
If you want to stretch it that far, I guess you could, but most would not I think.
- RE: WEll, - Lew 12:55:24 08/29/17 (4)
  Perhaps most would not, but Nelson Pass has been building and selling such devices for years.
  - Nelson Pass Class A (Open in New Window)
  - RE: WEll, - vinnie2 18:26:32 08/29/17 (3)
    I wonder if it sounds anything like it's tube powered brethen?
    - RE: Sony VFET set - BenM 20:34:48 08/29/17 (2)
      Sony VFET SET - best of both worlds. Diyable, but VFETs are now in short supply.
      
      Example here:
      
      Build with light bulb resistance load, resistor load, or choke (Hammond 193V) load.
      
      http://www.diyaudio.com/forums/pass-labs/201655-lamp-simple- (Open in New Window)
      - I think Nelson Pass wrote somewhere - Lew 21:17:49 08/30/17 (1)
        
        In Reply to: RE: Sony VFET set posted by BenM on August 29, 2017 at 20:34:48
        
        that he cornered the market on VFETs or some other SS device that closely mimics a VFET. Anyway, he has them, so far as I recall.
        
        RE: I think Nelson Pass wrote somewhere - BenM 22:14:54 08/30/17 (0)
        
        In Reply to: RE: I think Nelson Pass wrote somewhere posted by Lew on August 30, 2017 at 21:17:49
        
        He bought a lot of Sony VFETs but he did not have enough for commercial production. He then had a now defunct company SemiSouth make a batch of SITs (static induction transistor - also known as VFET or vertical field effect transistor) at a price of $300,000 which he uses in his First Watt SIT amps.
        
        He designed a VFET push-pull amp and in collaboration with DIYAudio, made available his Sony VFETs in a diy kit for diyers (I have one). Apparently he has a single ended design that will also be made available in kit form to diyers soon too.

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