Looks like you have the fix well in hand. I'll bet the stock carbon
comp. resistor was underrated and eventually gave out. It took a long
time but it eventually happened. I tend to engage in overkill in my
fixes because I don't like crap outs. In my case I installed a
switch that bypasses the in-rush resistor. None of this automatic
solid state RC time constant stuff here that can crap out again.
Manually bypassing the in-rush resistor after a second on power on is
an additional step but it's no big deal. And of course I flip the
switch to put the resistor back in when I shut the amp off.
If you are operating a continuous duty mode it doesn't take long to
fry that resistor. I noticed the squashed trapezoid and smelled
burning epoxy right away. It was a cold night in January around 10
years ago and I had to heave my amp off the table and put it outside
behind my house for the night, otherwise the house would have stunk
with toxic fumes and I would have had to go to a motel to sleep. I
will never go through that again.
73
Rob
K5UJ
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