My new 2204 copy works - except for the presence control.
With no input and the master volume on zero, depending on the speaker
cabinet the amp oscillates at 100Hz or much more.
With one cab, the presence control actually controls the oscillation but
with the other, there's no control possible even with all the controls on
zero. Funny thing is that with the THD hotplate speaker attenuator, the
oscillation disappears even with just 4dB attenuation.
Any ideas guys?
cb

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