Re: Bass Guitar amplifier problem
If the hum is effected by the volume setting, have you got a guitar plugged into the input.
If nothing is plugged into the input when the hum is present then try a jack plug which is shorted, if the hum goes then the hum is just a case of residual mains hum interference.
It should help with a guitar connected to the input, assuming the guitar cable and guitar are good quality and wired correctly.
Mike
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