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Maynard A. Philbrook Jr.

In article ,
says...

On Sat, 30 Aug 2014 18:44:50 +0200, Cursitor Doom
wrote:

Correction! It's the scope loading on the output that's making the
amplifier unstable. Apologies...

Sounds like your problem is due to the fact that
the amp is on the edge of oscillating. This can
cause distortion, obviously.. The mere fact that you
attach something to it is the trigger. Or maybe you don't
have a proper test load on it, a test load should be a
non inductive load the amp is designed for.

Maybe you need one of those resistor and cap in series
across the output to force the impedance for the high frequencies
down to a manageable impedance the amp likes?

Or, you could be having issues with the miller feed back compensation
network, which is to help keep the amp from Os-Kill-lating! Not
to confuse that with ovulating!

Jamie