I have had this problem a few times, when playing a gig or full volume band practice.
on channel 2, with contour. Master Volume 3/4 all the way up.
when the gain, goes past 12:00 the amp turns off. You have to unplug the power, unplug speaker cables and then it works for a minute or two then turns off again. This happens after playing for longer than an hour. The issue resolves itself if the gain is reduced.
-at first I thought it was a faulty speaker cable, I had been using a cable with cheap connectors that had after a show been smashed together in transport, and shorted out. Replaced the speaker cable and finished the next gig, and few band practices.
-looked like the old power tubes had finally died, one was glowing bright blue. Replaced the tubes with mesa tubes, band practice went well a few times. Then the same old problem.
-figured maybe there was a bad pre-amp tube. I had never replaced the tubes, and I bought the amp used so I figured it was not a bad idea to replace. worse case I had an extra set of tubes, which is something handy to have around anyways.
-I quit my band, and the amp has been only used at my apartment at low volumes, but pre-gain all the way up, no problems. Last weekend we used my gear for a backline, since the mesa was so versatile we used that as the main head for all the bands. It worked great for the first two bands, the third band wanted a lot more distortion, and again at a loud volume with the gain up past 12:00 the amp powered down, no lights nothing reduced the gain to 12:00 powered it back on, and it worked fine for another 4 hours.
any ideas? has anyone else had this issue?
on channel 2, with contour. Master Volume 3/4 all the way up.
when the gain, goes past 12:00 the amp turns off. You have to unplug the power, unplug speaker cables and then it works for a minute or two then turns off again. This happens after playing for longer than an hour. The issue resolves itself if the gain is reduced.
-at first I thought it was a faulty speaker cable, I had been using a cable with cheap connectors that had after a show been smashed together in transport, and shorted out. Replaced the speaker cable and finished the next gig, and few band practices.
-looked like the old power tubes had finally died, one was glowing bright blue. Replaced the tubes with mesa tubes, band practice went well a few times. Then the same old problem.
-figured maybe there was a bad pre-amp tube. I had never replaced the tubes, and I bought the amp used so I figured it was not a bad idea to replace. worse case I had an extra set of tubes, which is something handy to have around anyways.
-I quit my band, and the amp has been only used at my apartment at low volumes, but pre-gain all the way up, no problems. Last weekend we used my gear for a backline, since the mesa was so versatile we used that as the main head for all the bands. It worked great for the first two bands, the third band wanted a lot more distortion, and again at a loud volume with the gain up past 12:00 the amp powered down, no lights nothing reduced the gain to 12:00 powered it back on, and it worked fine for another 4 hours.
any ideas? has anyone else had this issue?
