I have been gifted an old Valley People QLZ quad microphone preamp (picture attached).
I recall when these came out (1980's) and were novel for having a low input voltage noise without using a transformer. I'm looking for a schematic of the entire unit. I'm thinking of restoring and perhaps modifying the preamp and a schematic would be very useful in that process. I am confident that I could trace out the schematic where standard op-amps are used. I might have found a pinout of the Valley People modules and perhaps that will be enough information to trace out the remainder of the schematic. But if anyone knows where to find a full schematic, please let me know; it will save a lot of work.
Thanks,
Tom
I recall when these came out (1980's) and were novel for having a low input voltage noise without using a transformer. I'm looking for a schematic of the entire unit. I'm thinking of restoring and perhaps modifying the preamp and a schematic would be very useful in that process. I am confident that I could trace out the schematic where standard op-amps are used. I might have found a pinout of the Valley People modules and perhaps that will be enough information to trace out the remainder of the schematic. But if anyone knows where to find a full schematic, please let me know; it will save a lot of work.
Thanks,
Tom
