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One more niggling problem: horizontal ringing.
That is, ringing in the horizontal sweep waveform. I see it
in a scope waveform with a probe dangling near the yoke.
It looks to be about 175 kHz. This is very clear.
I see it as waviness in a diagonal line pattern across the screen,
barely visible. I see it as bright bars in a black background, barely
visible. I see it as scrunching up or spreading out in the bars
as a scene pans across the screen. This actually is clearer
than on the diagonal bars.
I've tried finding this problem in the archives here and
find two suggestions: replace the damper tube and the
270 pF capacitor in the yoke. I have no mica caps in a high enough
voltage ... would two 130 pF 6 kV ceramics in parallel do? I
don't know if our stock has the 6AU4GT.
Question: are there other things to check, especially ones
I can just "test" to see if they are good?
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