My Mesa Walkabout seems to have a problem where both 12AX7 valves have failed at the same time.
They no longer glow and even though there is speaker hiss when the amp is on,there is no sound from any input source.
A search on the net led me to try plugging into the FX return which bypasses ALL controls including the master volume, this works fine and,and using an external
pre amp would get me through a gig .
Trouble is ,I have 2 gigs this weekend so my question is ,would it be safe to do this ?
Also ,why would both vavles fail at once,is it a sign of a bigger problem.
Any help appreciated.