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In Reply to: RE: 6AQ5 PP amps posted by Eli Duttman on April 09, 2014 at 23:12:55
Re: pentodes run in their native state, just passing on what others have claimed. Good to know the 6V6 can sound nice when correctly implemented when wired as a triode.
Still, I don't think an amp designed to run three ways will run each optimally... and that the triode mode is likely to be a compromise.
Cheers.
“As long as we have any intention to be right… we should be wary. So long as words have the slightest ego attachment, they are dishonest.” Charlotte Joko Beck
Follow Ups:
Also in the family are 6L6 and KT66.
These are really nice in triode.
Totally different but nice.
KT66 is more 45-ish.
6L6 is more 300B-ish.
DanL
3 ways will be tough. OTOH, triode/UL switching usually works out OK. In the case of 'AQ5s, with their fragile screen grids, a 1 KOhm resistor to connect g2 to either the plate or the UL tap ensures that dissipation is not excessive. The fragility of g2 is the key difference between a 6AQ5 and a 6V6. Don't expect miracles of heat handling from the little 7 pin mini package.
Eli D.
Eli,
I try to design my 6AQ5s to operate at 210 VDC P-K and about 27 mA, give or take a small amount, triode connected.
That is ( 210 times .027A. ) or 5.67 Watts plate dissipation, on a 9 Watt ( triode connected ) rated tube, which is 63 percent of rated plate dissipation.
Notice how close this 63% is .....to the Golden Ratio ? Tube should sound relaxed, unstressed thermally, and last for 10,000 to 50,000 hours !!
Jeff Medwin
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