Re: 48-440 Hz AC power compatibility option (HP 8660B OPT 003) - acoustic noise (hum/buzz) from the unit?
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Well I have run into the laminates?also. But on a HP8640b it was the transformer and it finally let the smoke out. This happened some 20 years ago and on that generator I plumbed in a external linear supply. It lives in the basement and is a backup backup backup... So trying to find a replacement never made sense. Paul
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