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In Reply to: RE: Tube amp help posted by crgolfer on April 29, 2015 at 11:35:12
I just found the answer to changing the .0015m to a larger value and it is no. This cap sets the low frequency response.
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I'm suspecting C107, C207, C20
C20 is common to both channels.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
While you are correct, and it would not solve the OP's problem, I would sure replace that sucker! Probably with a discrete cathode C and R for each channel.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
I completely agree. Separate, shared, O/P tube RC bias networks (1 network/ channel) is THE way to go.
Suitable matched pairs are not that difficult to come up with. Matched quads are a more costly, problematic, proposition. The shared network in each channel compensates for minor differences in cathode current. :> ) Get gm very close (always a requirement), along with reasonable closeness in cathode current, and you have a suitable matched pair.
Eli D.
Thanks for all of the help.
I was able to solve the problem by checking the connections for the .047 cap. I moved the cap around a bit and the wire broke off at one of the solder connections. It is a solid wire which while still intact was, in fact, not connected in the circuit. The amp in working fine after making the repair.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
R112 and R212.
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