Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: guitardude57 on June 22, 2016, 12:32:52 pm
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Curious, has anyone tinkered with the circuit in these amps, I have found some older posts on these,
and was wondering if any additional things have been tried.
Results?
Thanks
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I have one, a combo. I have changed a few things. First, most of of the later versions have a large cathode resistor and run the tubes way cool. I changed this for 90% dissipation. I installed a foot switch jack beside the loop input that now controls the hot switch.
On the Tone Stack I changed one of the caps that connect to the Bass to allow for more Bass to pass.
Other than that I have not done much. I bought it real cheap and planned to simply sell it, but I have been playing it for a couple of years now.
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Thanks Ed.
Yeah I have a Randall Diavlo 45 another tech could not figure out. Between a lefthand break input Cliff jack, that should have been a right hand break...and a dead opto on the input, got it running. I like it so much will likely keep it...lol
What values on C7 and C10 did you try? Or, did you just "up" C16 ?
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Thanks Ed.
Yeah I have a Randall Diavlo 45 another tech could not figure out. Between a lefthand break input Cliff jack, that should have been a right hand break...and a dead opto on the input, got it running. I like it so much will likely keep it...lol
What values on C7 and C10 did you try? Or, did you just "up" C16 ?
I could not get a Schematic, so I cannot tell you by number. If you have the schematic, please post it.
I simply upped the Cap to allow more Bass since the amp came with a nice 12" greenback.