Monitoring the primary line current might indicate if it's
mechanical or electrical in origin.
Steve
> Regarding Dick K5AND's suggestion, the transformer is held is 8 places.
> 4 bolts on the bottom, and 4 on the top. I had the bolts on the top out
> to replace the 50Kohm x 50W power resistors used to derive the cutoff
> bias. That may have changed the mechanical pre-load on the transformer.
> Maybe I'll let the PS warm up and then loosen and re-tighten those bolts
> to see if that helps.
>
> Thanks,
>
> Mike W4EF...........
>
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