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In Reply to: RE: couldn't you... posted by Jim Dowdy on September 08, 2014 at 10:49:19
then I would eliminate the cap altogether and let the bias supply feed the grid. Job done and full A2 capability.
Naz
Follow Ups:
"I would eliminate the cap altogether and let the bias supply feed the grid."
Don't forget that the capacitor serves to decouple audio-frequency AC at the bottom of the secondary. It has to provide a low-Z path to ground at the lowest frequency of operation in order to be effective. Any bias supply capable of substituting for that would need a similarly low-Z output capability.
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Buy Chinese. Bury freedom.
Sorry, I should have been more specific. Eliminate the cap and feed the grid through the secondary. In fact I would do it this way even with the Tent Labs Bias supply. Yes, the bias supply must handle all the A2 grid current but as I said, I have had extensive experience with 845s and know that it will get him further into A2 than a Sim will indicate.
I don't know enough about the Tent Labs supply but I would strongly suspect that it will handle that reservoir cap I mentioned and that would certainly help transients go all the way into A2.
Naz
I'm not being critical, just trying to understand - given the overall expense of this undertaking:a) is DanL attempting to limit "full A2 capability?"
b) does a 10 mA (stereo) bias supply vs a 50 mA supply constitute serious design limitations/concerns?
Edits: 09/08/14 09/08/14
The limiting factor is the Tent Labs Bias supply so I see basically two options, ditch it for something with higher current capability for full A2 operation or use it a find the best compromise. I think we are working with the latter.
From experience, I know that it can be made to work reasonably well but more current would be a better solution. That's my only point.
Naz
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