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Many thanks for the advice!

I removed the caps, tested them for leak at 100V DC and checked the values.
C183 (nominal: 560pF) reads 600pF
C184 (nominal: 47pF) reads 74pF (in fact the cap installed was 68pF)
C177 (nominal: 150pF) reads 155pF

So I guess the next step would be (1) to put back C177 and (2) replace C183 and C184 (which are in parallel) with the correct capacitance. I could maybe determine the optimum capacitance by connecting a variable capacitor and adjust for maximum voltage amplitude on the load?

[QUOTE="Summertown, post: 815744, member: 65077"] Many thanks for the advice! I removed the caps, tested them for leak at 100V DC and checked the values. C183 (nominal: 560pF) reads 600pF C184 (nominal: 47pF) reads 74pF (in fact the cap installed was 68pF) C177 (nominal: 150pF) reads 155pF So I guess the next step would be (1) to put back C177 and (2) replace C183 and C184 (which are in parallel) with the correct capacitance. I could maybe determine the optimum capacitance by connecting a variable capacitor and adjust for maximum voltage amplitude on the load? [/QUOTE]

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