I own an Carvin Legacy 3 100W head.
Yesterday was playing at low volume, then a loud buzz started at a level that cover the sound.
The buzz goes away when the reverb pot is zeroed and I can play normaly. The buzz come back if the reverb pot is at any point different of zero, even the reverb is on or off.
I have some electronic skills but could not found a schematic for this amp and I have no idea what is causing this problem. Can you give me any information that help me?