172 - Dual Signal Leveler

This is a build I'm doing for a friend.
I don't have (or ever have seen an original 172)  vintage one. They must be very rare.
Do contact me if you have a original you'd like to sell.

Until that time, or until Buchla USA decides to make one, this will have to do.

Anyway, back to the build.

These boards are from LA67 in Spain.
They are based from original schematics so I hope will be close to the original.

rESISTORS first

Looks like a really easy build.

The original Buchla 100 catalogue describes the module as:
"Two high-gain, constant-output amplifiers. Output signal levels are maintained at 0db (plus or minus 1 db) for input variations from -40db to +10 db. Time constants are variable from .05 to 5 seconds."

So it appears to be a basic compressor/limiter with a time constant knob for each side.
The time knob I guess sets the attack/release compressor speed ??
A slow time probably provides very gentle changes in loudness where as a very fast time produces an aggressively signal.
 You will usually find in most compressors that even if the peak levels are set the same, a compressed signal will sound louder if it has a faster recovery time.
Im not sure if this module works the same

 Anyway, the build is all descrete components, & through hole.
Nice.

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