QUAD 303 - "Motorboat Effect" - Solution?

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G

Gliding Dutchman

Guest
I have a QUAD 303 power amp.

It is sounding very good and performs well. All capacitors has been replaced a year or two ago.

There is one problem:

When I turn it one the left channel will cause the speaker to pump erratically for the first 5 to 8 minutes and then it will settle. This errattic output corresponds to almost 20 volts on the DMM!

What would be the cause of this?

Danke,
GD

 
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