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In Reply to: RE: Own a Rare First Watt VFET/SIT Amp posted by Cappy on October 05, 2016 at 08:54:04
What I find odd in this world of amps that cost 5 even 6 figures that these devices are not being made for audio. A friend of mine was in love with them decades ago. His favorite set up was a push/pull pair of 2A3 triodes. And I recall him saying that the Sony VFET had curves that looked like a 2A3, a really great triode. Think about the possibility of a solid state 2A3 amp with high power. Someone should look into having VFET devices made. I 6 figure amps have a market and there seems to be one, then someone should design a high power VFET amp and pay for the devices.
Follow Ups:
And got a good run of parts before the semiconductor house went belly up.
That was my point. Charge enough for a potentially great amp and pay to get the devices back in production. What's more linear than a good triode and linearity is the name of the game.
I think the difficulty is getting a variety of manufacturers on board such that a buy could be made from a house that isn't going to go out of business anytime soon. There would also be the trick of doing follow up orders...
If these devices and/or circuits that use them best are recognized as superior to other ss devices/circuits why wouldn't there be sufficient demand? Are you implying that not enough designers and customers agree?
The 1st devices were actually designed for the power supplies of TVs. When power supply design changed they were no longer produced since there was no need for quantity production. New production would be costly and money usually rules.
No designer would argue against a device as linear as a 2A3 tube one of the best output devices ever albeit low power. It's even a more linear device than the vaunted 300B tube. So a good VFET would be like a high power 2A3 amp but with even better coupling(higher damping factor) due to the elimination of the output transformer of the tube format.
Of course we eliminated the transformer in our design; what I find appealing about the SITs is that they have the same soft clipping as a triode so as I see it they solve the endless tubes transistors debate.
Only thing is of course, the semiconductor industry doesn't want to make them. High end audio being what it is, we are teeny tiny compared to other industries.
VFETs are triodes and the curves of both look very similar as they should.
were the Yamaha and Sony V-Fet efforts of 30 years ago thought of as high-water marks? I recall much hope, and then exchanges of puzzled looks, no?
Jeremy
No they weren't. They were interesting a considered good but not great. But they didn't make the best use of VFETs, way too much negative feedback for one thing.
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