Appendix to marathon note:
........
>>Here again, expensive and good polypropylene caps makes a hell of a
>>difference from cheap ones.
>
>My only caps are ceramic bypass and electrolytic P/S filtering.
>Where did you use polypropylene? For coupling?
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Oops, forgot about the small caps [1-20 pF range] across the op
amp feedback Rs, used for overshoot & BW control. Ceramic.
Would polypro work better here?

regards,
- Dan Michaels
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