Recently purchased this amp,not sure if of its manufactured date, and I get a humming (feed back) sound about 2 minutes after I first turn it on(about 20 seconds of loud humming) with or without the gutair plugged in,then it goes away. Need advice please.
SN# B-216121 made in Mexico.
Thanks
Stratman
Hey stratman!
Are you using the standby to warm things up or just turning everything on at once? Sounds like a possible tube problem to me but it's odd that it comes and goes...
