AMPEX 350 Mic Preamp

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-separate power supply
-octal tubes (12SJ7 preamp tubes)
-paper/wax audio capacitors
-balanced line input is a pad on the mic input. If used, the pad should be rebuilt with low noise, metal film resistors.
-“record calib.” pot is accessible
-large input and output transformers
-single ended output section with ordinary negative feedback loop through a resistor