Golden Age Premier Pre-573; 500 Series Module; 1-Channel vintage style microphone-, line- and instrument preamplifier; no integrated circuits in the signal path, only discrete components like resistors, capacitors and transistors; Carnhill input and output transformers; total gain range -10 to +80 dB; max. gain range Mic: 80 dB; two-position 6 dB / octave highpass filter with fres of about 45 or 180 Hz; Phase switch; +48V phantom power switchable with a LED indicator; selectable AIR equalizer adds a boost of about 6 dB centered at 30 kHz; Housing: 500 Series Module
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These merchants probably sell this module. Huh?