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In Reply to: RE: Filament supply with no center tap posted by banpuku on February 22, 2017 at 13:17:28
PAT
The filament transformer is also part of the cathode circuit.If you are going to use existing ones on a multi-tap power transformer,the filament leads have to isolated from the other leads as if they were a totally separate transformer already.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
Mikey,
Just an FYI: I have it up and running using the PT supplies. Almost no hum and certainly less hum than before using the dedicated filament transformers. Cool!
Pat
Pat
I looked at your transformer schematic and the filament leads are totally independent of your other leads so that's good.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
If you have disconnected the original Ef XFRs, that - will most probably be the cause of LESS hum. Your individual Ef XFRs were smack dab "on top of" both the driver tube, and the output tube, on each channel. ( N.G. )
Recall me discussing, Ef XFR located far away, using all 6 inches of ( redone and better quality ) leads ??
FYI, the best way to do any DHT execution IS with separate Ef XFRs, but that implies monoblocks, which is also the BEST and easiest, least-compromised way to do optimized lay out.
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My new DC mono 2A3 amps should be up and playing within two months. Have fun listening and learning .
Jeff Medwin
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