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470K resistors

You mentioned that the cc resistors would not work on the bottom side of the board either- so the bit about the metal films may well be inconclusive. There are newer metal film types now that are about 1/4 the size that you would expect: a 1 watt version of these is half the size of a 1/2W cc resistor! They are also lower noise in our experience.

The fact that the amp is this easily upset suggests to me that it operates right at the edge of its phase margin- a tad bit too much feedback. Due to the kind of load it has to drive, opening up the bandwidth with newer parts seems unlikely to help out.


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  • 470K resistors - Ralph 08:50:25 10/15/20 (1)

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