filter and tone toggles Audio Research SP-4 Preamp
I would like to know the funciton of the toggle switches: first one: up position = filter, down position = out, second one: up position = tone, down position = out.
Tjaco, Did you ever get an MC cartridge paired with your SP-4? I currently have an SP-4 and am using a Grado MM Cartridge and thinking of upgrading to an MC. I am curious about your experience with an MC on that preamp.
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