Unstable when connecting PSU

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Im in the making of designing my own ~40 W class B poweramp
THD when using ideal -+30 V rails is about 0.001% at 1kHz with 1V rms in.
But im having some problems with an unstable PSU ****ing up my THD.
Any suggestions what I can do with my design to give it more
security against PSU ripple

An externally hosted image should be here but it was not working when we last tested it.



/Nysan
 
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