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Given the nature of the circuit at the contrast control, which is just a bypass cap
(and there is also a 0.0015uF in parallel, more or less!) I'd just use a 500 ohm
non-wirewound pot with the cap simply across it.
The over-meticulous person would run a computer simulation to see what
difference it would make. I did ... very little.
At low contrast this circuit a 6 dB boost at 3 MHz. The center of the
curve rise is about 100 kHz.
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