Berning ZH270 help

Sounds like a terrible problem and I suggest you sell it immediately....to me. Just kidding (sort of). Good luck getting it sorted out. Bob

DId you switch tubes from one channel to the other to see if the problem changes channels? If you did and it stays in the same channel, it's probably not tubes. In that case I'd get in touch with David Berning or Allan Bhagan.

If one of the tubes are not within it's spec, the amp will see it within 1/60 of a cycle and continue to try and correct it within every 1/60 of a cycle while limiting current to the tube, which turns the LED red, if you turn the amp off and then on again and the problem is gone for awhile, that could mean the tube warmed up and is now operating within it's specs.

So as Oneprof suggested, please swap the tubes from one channel to another and see what happens, I suggest only doing the outputs firsts and try it that way for a while and see what happens.
It would also help to know the age of the amp.

Please feel free to e-mail me.
Allan

Thanks for your kind and appreciated help. I've forgot to tell I tried to swap the tube, power first and pre after but the problem persist on just left channel. It remembers me once when I had one cap gone with another amplifier...
I'm in contact with a good service here in Italy, I'll take my ZH270 there.
Hey Allan, I'm Paolo from Italy...you may not believe but I've not yet received your post. It should arrive anytime these days....Italian Post Office....