[sdiy] Buchla 291e teardown

Darren Shorsky dschnidsky at hotmail.com
Mon Dec 26 19:03:10 CET 2022

If it uses the 2164..... it may be similar to any one of the filters that Dave Dixon has built over the years.
The 2164 being his go to chip for almost everything.....  he also doesn't use vactrols as far as I'm aware.
Perhaps he'll come by and shed some light. fwiw.

From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Lanterman, Aaron D via Synth-diy <synth-diy at synth-diy.org>
Sent: December 26, 2022 9:51 AM
To: synth-diy mailing list <synth-diy at synth-diy.org>
Subject: [sdiy] Buchla 291e teardown

I’ve always wondered if the 291e uses Vactrols like the original 291. It doesn’t! It’s completely different. It uses SSM2164 VCAs, so I’m guessing it’s probably closer to the State Variable Filter in the Oberheim OB-MX.

Here’s a video of me taking it apart, looking at the PCBs, and putting it back together:


Aaron Lanterman, Prof. of ECE, Georgia Tech
My blog on Education and Innovation: https://edupocalypsenow.wordpress.com
My blog on Electronics and Programming: https://lantertronics.blogspot.com
My YouTube channel on Electronics and Programming: https://www.youtube.com/c/lantertronics

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