**Limited stash in perfect condition from my personal 500 rack**
 
The 323 Discrete Mic / Instrument Preamplifier for 500 Series is powered by an original and proprietary 9-transistor Amplifier and boasts 3 Cinemag Transformers. Switchable inputs of Microphone or Hi-Z instrument (balanced or unbalanced). Only the finest components are utilized in this high end piece. Vintage style metal can transistors are used for the audio signal while modern surface mount semiconductors handle the electrical supply signal (current sources).
 
2nd GAIN STAGE: Switchable HIGH PASS FILTER.
The 80 Hz High Pass Filter is great for getting rid of rumble and an indispensible tool.
This unique circuit also adds an extra layer of delicious discrete transistor amplification. 
 
Discrete, Original Design 
Cinemag Transformers (3)
Hi-Z D.I. Input (Guitar, Bass, Synth, Drum Machine)
10 LED Output Meter
20dB Pad
Polarity Reversal
48V Phantom Power
High Pass FIlter