Dynaco-Doctor Forum

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RE: St-70 / Pas 2 Hum/Buz

Posted by Joe Curcio on March 7, 2011 at 17:10:23:
Quick test - connect your preamp and run a separate ground wire fro the preamp chassis to the amplifier chassis to see if it changes the hum. Let me know what you find

2nd test - have you tried the suspect preamp with another power amp?