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Title: Internal Trimmer in PI section Post by: shebbycaster on May 22, 2011, 12:55:41 AM My Expression has an internal trimmer that looks like it adjusts either the negative feedback loop or voltage in the Phase Inverter section.
How should I set it to get the best tone? Title: Re: Internal Trimmer in PI section Post by: shebbycaster on May 25, 2011, 12:38:20 PM I found out from Nik that the trimmer is on the tail resistor of the phase inverter. He suggested adjusting it by ear paying special attention to the overdriven sound. I will also check to see if it affects the voltage on pins one and six of the phase inverter tube similar to the PI trimmer on an OTS.
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