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jubilado · 4th Jul 2019, 10:38 pm

A problem still persists...
I've checked the capacitors I replaced for polarity and they are OK. The problem with the thermal delay is "fixed"
BUT
When I turn the volume to above about 90% the a loud rapid beating/throbbing/pulsing noise comes from the speakers and the pilot lights dim in synch with this. I've run the amp for hours at low levels and everything seems to be fine. The noise /effect is present on both channels and on all the inputs I've tried.
Is this a problem with the power supply?

4th Jul 2019, 10:38 pm	#20
jubilado Triode Join Date: Jun 2019 Location: Edinburgh, Scotland, UK. Posts: 30	Re: Armstrong 626 problem at high volume. A problem still persists... I've checked the capacitors I replaced for polarity and they are OK. The problem with the thermal delay is "fixed" BUT When I turn the volume to above about 90% the a loud rapid beating/throbbing/pulsing noise comes from the speakers and the pilot lights dim in synch with this. I've run the amp for hours at low levels and everything seems to be fine. The noise /effect is present on both channels and on all the inputs I've tried. Is this a problem with the power supply?