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In Reply to: RE: Valve preamplifier biasing posted by Tre' on February 26, 2021 at 13:02:27
Some folks say F3 needs be a decade (2 Hz.) away from the passband, while other people think 2 octaves (5 Hz.) away is OK. That makes the absolute minimum value for working into that blasted IHF "standard" 10 Kohm load 3.3 μF.
My price/performance suggestion is a 4.7 μF. metalized polypropylene part bypassed by a 0.47 μF. 716P "orange drop". An improvement is a 0.33 μF. PPFX Multi-Cap as the bypass, but costs escalate.
Eli D.
Follow Ups:
In some rooms, with some speakers, the higher F3 can be better but if the room is tamed properly and the woofers (and woofer amps) are up to it, then the lower F3 can be better.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
The 7.5 uF, 330V ASC are not the worst linestage coupling caps. Not even close. They'll tolerate any reasonable B+ required, are easy to get and are not very big... :)
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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