VintageKustom.com: Repairing Kustom Amps » pulsating loud bass static sound

Re: pulsating loud bass static sound [message #20625 is a reply to message #20620]

Fri, 16 May 2014 08:03

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Tell the tech that if he disconnects the red and green wires from the power supply filters that feed into each preamp and the problem still takes place then the issue is narrowed down to the power supply and or driver / output stage.
There are very few Tantalum type caps on the driver board and I would start by changing these out for all of the 3 dollar total parts cost that
it would be.
Also when the amp is acting up if a voltmeter is placed across the speaker jack and you see any level of DC voltage higher than .070, you`ve got electrolytic cap problems more than likely and those Tantalum caps can make for that, as can the two big main power supply rail filters.
I would print my reply here off as pass it along to the tech you use.

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