I think I may have killed my MT200. Over the years, I have been lucky in keeping it up and running, but this time I was not so lucky.
So, I recently started having some trouble with the MT200 coming out of protect mode. A few years ago, I had a similar problem. After reading through threads here, I found that it may be a neon amp issue, so I ordered some replacements. When they arrived, I swapped out the lamp, and I was up and running again. (BTW, I also replaced every electrolytic cap at that time, to give the amp even more life) The amp has worked great since.
Fast forward, 3 or 4 years later, and I again started seeing signs of lengthy protect mode startups. So, I thought I'd try replacing the lamp again. All seemed to go well, but on the first start up after the lamp swap, I heard a very faint crackle sound. So low, I thought it could have been my imagination. After warm up though, I am now not getting any sound from either channel. The amp still powers up as usual, and everything appears to be working, but I get no audio.
Today I opened up the MT200 again, to look for anything obvious, but the only thing that I found which may be a problem, is a resistor, that could possibly be blown. The resistor is found on the PSU Loading Chart schematic, and is labelled R42 (200ohm /.05w). (FYI. The actual resistor on the board is 270ohm/.05w) I'm putting a picture below. As you can see, the center of the resistor looks a little brown. Before replacing it, I thought I'd post here for thoughts.