I have been previously inclined to take altering coupling caps over changing cathode bypass caps when trying to reduce the famous 'bass flab', especially in Fender amps. To me it's a more straightforward mod and doesn't immediately impact the initial gain structure at the onset/input. I feel that by significantly lowering the early cathode bypass caps you are already messing with the gain structure (and EQ/onset of distortion/ NFB) in a way that would have to be corrected further down the chain. And to have an impact you really have to go down to 3uF or less instead of the standard 22uF cathode bypass cap. One could change cathode resistor values to even out the mix but i am rather reluctant. I feel that with coupling caps between gain stages (after the plate) there's less to do to make up the loss Could someone please convince me otherwise? I might be biased..correction: i AM biased! Real techs please step up to the plate D, ok i'll stop now)..