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Perreaux S150B oscillation

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My Perreaux has an oscillation problem.
Please whatever insight or experience you may have.
Its sine wave falls apart when power is applied.
Oscillation is the big problem and is occurring on both channels.
The power supply tests good at 150 millivolts.
The amp goes berserk at high frequency- 150khz.
Nothing is burnt.
Thanks for your help.

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