"Output Transfo + FETs" Amplifier

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GlidingDutchman

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Joined 2007
#1
From this thread:

http://www.diyaudio.com/forums/showthread.php?s=&postid=1795228#post1795228

I thought I start a new thread on "SS Amplifier using Output Transformer" based on this readings:

http://www.susan-parker.co.uk/zeus.htm
http://www.susan-parker.co.uk/zeus-construction.htm

Maybe I am chasing ghosts but I think it is worth a bit of discussion.

Basic circuit idea:

SS output devices into a low impedance OPT
Driver stage 6922 or 6H30Pi or something suitable
Tube phase splitter stage
100 watts per channel
 
#7
Andre Visser said:
Now why would you want to ruin the sound of mosfets with a transformer? :whazzat:
Click to expand...

He's not. He's trying to fix that. The SEPP output that uses complimentary N-Channel / P-Channel pairs pretty much SUX. It works just fine with BJTs, but BJT complementary NPN / PNP pairs are a good deal more complementary than MOSFETs. Stick with N-Channel or P-Channel devices, but not both in the same circuit.
An externally hosted image should be here but it was not working when we last tested it.
I've never heard one of these that didn't sound, more or less, "off". Of course, the "Big Box" manufacturers like that because no OPT is cheaper than the cheapest OPT. And a really good OPT is much, much better.

You want to use MOSFETs, then your choices are either use an OPT, or Circlotron, and keep 'em as far away from Class B operation as you can, which will mean big heatsinks. The X-over behaviour is hideous.
 
#10
Miles Prower said:
You want to use MOSFETs, then your choices are either use an OPT, or Circlotron, and keep 'em as far away from Class B operation as you can, which will mean big heatsinks. The X-over behaviour is hideous.
Click to expand...

OK, mine run in Class-A and I’m very happy with the sound quality.

My opinion is that transformers are quit good for power supplies, not for audio signals. 😀
 
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