je viens de trouver ca dans le manuel du studio 22 mais ils ne parle pas
Citation:
Here are some general guidelines for preamp troubleshooting: if the
problem affects only the Lead mode, it's probably caused by the V1 tube (the
one furthest to the right, as seen from the rear); but may also be V2 or V3.
If the problem is in the Rhythm mode only, then V2 is usually the problem
(V2 is second from the right, as seen from the rear). Sometimes a Rhythm
problem can also be V3. If the reverb is noisy or has a problem, replace
V4