[sdiy] Buchla 191 Sharp Cutoff Filter

[Aaron Lanterman]

Anyone know what's in the guts of the sharp cutoff filter - i.e. what  
topology, are vactrols used, etc? I was sort of surprised to see a 4- 
pole Buchla filter!

I don't see the schematics on Magnus's site, and his is the most  
complete collection out there, so I'm guessing this is a rare beast?

- Aaron, currently going through a Buchla obsession