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Celestion S8 Has a high pitched squeal with or without input signal, gets loader after warming up.

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Voltage regulator output electrolytics (220 uF/16V) heat up and start squealing/making geiger counter noise several minutes after power on. Noise stopped when electrolytics are sprayed with freeze spray. I intend to move the regs to the power amp heat sink (with heat sink greased insulators), add .1 uF tantalum caps to the regs output as close to the regs as possible and replace the 220uF/16V electrolytics with higher voltage units.

Posted on Mar 22, 2009

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Most likely there are electrolytic capacitors in the power supply and also possibly in the amp sections that are going high in ESR.

It would be best to test all the caps with an ESR meter and then replace the ones that are out of spec. You have an excellent chance that this will fix the unit.

If you are not experienced at doing electronics servicing, you can give the unit out to a service center to have it fixed.

Jerry G.

Posted on Apr 28, 2008

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