Hello everyone, I bought a Randall rd50C about 6 months ago and am very pleased with it, however recently I've been having some buzzing sounds from my clean channel but not my distortion channel. My local store (where I bought it from) had put in JJ tubes before I got it. It couldn't be the guitar because I used different guitars but the same results. Please help!!
My guess is that one of your preamp tubes has gone bad. If you can figure out which one of them governs your clean channel, test to see if it's failed and replace it if it has.
First check all the preamp tubes are fully inserted into the amp & not loose.

Have you got any spare tubes? Try changing, then replacing each tube. It's probably the V1 (nearest the input)