Hey all, I'm interested in why we choose particular grid stopper resistor values. You see a pair of 68k resistors commonly used in Fender style amps (1 for each input jack). I've seen various other values in use such as 33k in single and paired inputs, 56k and so on. What difference does this make to the tone of the amp and how do we arrive at selecting a particular value? What do you do if there is a single hi input in the amp design? I need to do some more reading on this but thought I would put it out to you blokes who have 'the knowledge! '