Re: Fender Amp
The problem of keeping the volume down on many of the Fender Hot Rod series amplifiers is due to the first volume pot after the input sockets being of linear resistance taper.
Changing the pot to audio taper would create a more useful gradation between 0 and 5. Performing this modification requires patience, skill, experience and adherence to safety precautions.
If you are remotely uncertain about how to perform any part of this task, engage an amp tech to do it for you. While the amp is on the bench, you might as well ask to have the Bias checked.