Quote:
Originally Posted by bandersen
After sleeping on it, it occurred to me that the plate lead is in series with that 68 ohm resistor so there's no potential difference to cause any arcing between them.
What I think is more likely is that the wire is stressing the phenolic board and flyback.
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there could also be the possibillity that where the wire enters the cage (without the tape wrap) that there may be a "capacitance" issue, where the wires insulation is acting like a dialectric, especially where the wire itself is touching the metel on the HV cage, hence, the reason for the tape wrap.
that added capacitance can throw the waveform off, causing the squeal.