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I had linearity troubles with both my electrostatic sets. The problem in both cases was not one thing. When you increased the coupling cap values to 0.01 did you make
a QUANTITATIVE test of linearity ... make a screen tracing one way and compare to
the other? If it improves, leave it with higher cap. I went all the way to 0.02 in my Pilot TV-37, which has the same value centering resistors. That done, there were still other problems with off-value parts. With all fixed, its got perfect linearity.
Use your scope. Luckily I have scope probes with 750meg and 2GOhm resistances that
work great at 60 Hz. At 15kHZ I need to use a capacitive divider. Check every spot
in the circuit. It could also be problems with the resistive focus chain. Note the
uusual place the vert amp B+ comes from.
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