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In Reply to: RE: couldn't you... posted by Triode_Kingdom on September 08, 2014 at 10:36:12
Thanks for the explanation, TK.Off the top of my head, I was guesstimating a 2k7 5 Watter would work (which would draw approx 18 mA per channel) - so, you'd probably need a bias supply that could supply 50 mA (stereo).
Edits: 09/08/14Follow Ups:
then I would eliminate the cap altogether and let the bias supply feed the grid. Job done and full A2 capability.
Naz
"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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