On Tuesday December 10, 2019, Wilfred Van Velzen said to Frank Linhares...
The first thing I would do is (visually) check the capacitors. Bad
ones are easy to spot. And are the first things to go in old devices
CRTs are a bit different than your run of the mill PCB, Caps are far and few
as they tend to use flybacks to generate their power.
I have replaced more than my fair share of caps on my Amigas and C64s. I
wish that was the issue.
It turned out to be a bad ground. The outlet I happened to use had an open ground. The minute I moved the SX over to another outlet whos ground was properly wired, the hum was no more.
I wish everything was this easy to fix.
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