![]() The amp was just out of warranty and had been sent back for repair twice for the same problems.Īfter trying everything to repair the amp I eventually replaced the Marshall power amp PCB assembly with an off the shelf kit with similar specs and a decent finned heatsink.Īll the nasty distortion and HF oscillation dissapeared. Like I say, my friend is happy as can be.I had an AVT50 with the same problem, was totally unstable. So maybe the amp does run as designed, and I am just very unfamiliar with that type of circuit/gain structure/amp. More gain than I am use to hearing from Tube amps with post-PIMV. But then again this is a SS amp with what I would call A Lot of gain. I am still not convinced that his amp is 100%. He says it feeds back less now that it did before I "fixed" it. Well, my friend picked up his amp and was very happy with it.
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