Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: isaac_teller on July 10, 2025, 02:37:38 pm
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Hi. I built a GA-8T clone with a one-tube reverb-1 x 6N2P(Russian 12AX7) and 3 PCL82(2 for power, phase splitter and tremolo and 1 more for the reverb. Quiet, works great but the tremolo is too fast even at its lowest speed. The 3 caps are all 0.047. Instead of increasing the cap size is it possible to increase one or more of the resistors?
https://schematicheaven.net/gibsonamps/ga8t.pdf
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Why don't you want to increase capacitor size? That is the proven way to slow the tremolo. You can easily experiment by clipping or tack soldering in another .047 cap in parallel. You can increase the cap size of one, two, or all three. The only drawbacks are that if you go too far the trem may not want to start (like a vintage Fiat) and or it might get thumpy. Changing resistors is typically done to change the intensity.
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Yes you can increase the resistor values to slow the trem. Try changing the 510k to 1Meg and see how you like it. Then you can try increasing the 240k.