[HAM] Adjusting preamp trimmer capacitor--pulsing noise?

[Brad Baker]

On 9/12/06, Randy Kesten <randy.kesten at juvamedical.com> wrote:
> Is it normal to get a pulsing/beating noise when the expression pedal is
> fully depressed and the AO-28 (1957 C3) preamp trimmer is turned
> counterclockwise?

No.  Just to diagnose, try it with vibrato off.

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