Raising Tremolo Volume....

[zozoe]

Greetings~ I have this early 8-tube Gibson GA40T thas has the 3-speed tremolo that I'd like to make noticeably louder. As you can see, V7(6v6) is the trem driver, & it's a strong tube, so no issue there. Someone kindly point out the resistor that needs its value changed.... Please let me know the value that (should be) in there, & then what value I should 1st try.... I know all the necessary precautions connected to poking around an amp, & performing this tweak is about as far as I venture.... many thanks, Kenny

 

[beaubrummels]

Changing the resistor on a tube would more than likely result in more distortion, not more gain. Negative grid bias keeps the entire wave of the signal below the peak capacity of the tube. Changing the resistance to try and get more gain will likely just cause the signal to be clipped, not louder.

 

[Ewizard]

When you say louder, do you mean more range?

This is a more unique tremolo stage. It utilizes a negative bias circuit driven by the 6SN7 ( I think that's what it says? ) to cause the 6V6 to oscillate.


These are the three resistors I would mess with. The lower one will more likely adjust the speed, and the other two will alter the depth more. However, I will caveat this to say that you are playing a dangerous game. Bias wiggle circuits like this change the bias of the power tubes, so if you go too far one way or the other, they can become biased too hot, or too cold. So note carefully what the value you take out is and where it came from, and do small changes one at a time.

 

[jeremy]

im assuming he means the volume/output when the trem is active

 

[zozoe]

correct Jeremy..... thnx