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I decided to to do the switching tech bulletin straight away, as it is only the addition of a 2.2kµF cap to the +15V supply. The tech bulletin from Mesa Engineering is very clear, although there is no a lot of room to work in this amp. Now the switching works properly. Thanks Mesa. Mark

I resent my support request to Mesa, and they responded within a day ( their rep in Germany). They watched my youtube video, and sent me the three Tech bulletins which address these noise and switching issues. The mods are easy enough, so I'll do them once I get the cap, two resisters, and one...

My TA-30 2x12 combi has very similar issues. I posted a similar video as you made here: https://www.youtube.com/watch?v=UebU30a0WIo&t=1s Did you contact Mesa Boogie support? I sent them a detailed e-mail nearly 4 weeks ago, as there is no M-B service partner in my country, but haven't received...