Vintage Mixing Console

TRIDENT: A-Range Channel Output Amplifier

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Trident channel amp schematic 824211dabc75

After some success with the Trident mic preamp (AKA the Revox A77 Preamp), I thought I might try another section of the console – this time the EQ / Channel output amplifier. It looks interesting on LTspice, as towards the end of the gain range, you get a distinct bump in the mid-range.   At the moment I’ve … Read more

RCA: BA-31C Preamp, Vero Layout (The Balmoral Broadcast)

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RCA console f6fd893ce63c

The RCA BA-31C would have been found in broadcast consoles of the day (late sixties), as a microphone preamp module.   I think it may have been the starting point for the Hudson Broadcast, as they look quite similar and I’ve heard some references made to RCA.  If it is what they used, I can … Read more