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Old 2nd July 2012, 08:46 AM
Richard Richard is offline
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Join Date: Dec 2005
Location: Notts
Posts: 4,770
Default Re: Wad 2a3 pse hum problem

Hi Paul,

Motorboating and hum are 2 different things though they may both be caused by the power supply.

Has the motorboating (a steady phut phut at very low f, c. 1 or 2 Hz) now gone? Are you just left chasing hum?

Hum may be the power supply or may be heaters. Check all the heaters for correct voltages and preferably for AC level on the DC ones.
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