Subj : Re: SX-64 Whine
To   : Wilfred van Velzen
From : Frank Linhares
Date : Mon Dec 16 2019 22:30:19


 On Tuesday December 10, 2019, Wilfred Van Velzen said to Frank Linhares...

 WVV> The first thing I would do is (visually) check the capacitors. Bad
 WVV> 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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