Amplifier pop

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MusicMan_ZA

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Dear Vintage Fundis,

I have a Sony TA-1055 amp (looks good and sounds great) that, when I switch it on, makes a loud "click" on the speakers, and when I switch it off, a very loud "pop" sound on the speakers.

This happens even with volume set to zero.

I have done some reading, and have measured the DC mV at the speaker terminals with volume at zero and AUX selected as source:
L = 12mV DC and R=14mV DC.

This was on the "B" speaker terminals, as my speakers were connected to the "A" terminals.

I have also fitted a 270V 0.47uF "spark suppression" capacitor across the 239V AC Live and Neutral cables coming from the the mains where they connect to the On/Off switch - this made no difference? Do I leave it, or remove it?

Any idea why this is happening, and advice on how to sort this out?

Thanks,
Johan


 

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