I have a Mesa/Boogie Rocket 44 that needs repairs. After 10 minutes or so, there is a loud hum. I do not believe that the hum is caused by my guitar's pickups, because they are two EMG 81s. Also, from time to time there is a loud pop when I turn on the standby switch or a loud pop when I turn off the on/off switch.
Can anyone recommend an amplifier repair person in the Boston area?
Thanks for your help.