Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Mattjaco1 on April 15, 2025, 02:16:36 pm
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Hello i just recently completed a hot rod deluxe to dumble pcb conversion using the luigi retro customs pcb board. The amp sounds great, but i was wondering if anyone could help me get more high end in the clean channel. It sounds very good, just a little dark. Someone on another forum suggested increasing c31 as well as increasing c57. Posting schematic for reference..
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Picture
Schematic did not show preamp tubes :w2:
Preamp tubes cathode bypass cap new value may help
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yes it does see v1a and v1b
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So even with all the switching, it's still too dark?
Maybe the best option is to buy an $80 eq pedal and then you can have a switchable option to boost or drop frequencies to get your desired tone, either at the front of the amp, or the effects loop.
The problem with trying to focus on only the clean channel, is it will also affect the drive channel.
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R5 to 82k-120k. 100k is the blackface Fender value. I've seen Dumble tonestack schematics with values up to 150k here. I'd start at 82k and play for a bit then adjust further if necessary.
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R5 to 82k-120k. 100k is the blackface Fender value. I've seen Dumble tonestack schematics with values up to 150k here. I'd start at 82k and play for a bit then adjust further if necessary.
100k did the trick. sounds great now! thanks for the help!