via this auction
"Buchla Frequncy Shifter / Balanced Modulator Model 285e
perfect condition, v30 firmware"
via Buchla
"The top section of the dual-function 285e performs frequency shifting; up and down outputs are simultaneously available. The reference frequency can be externally applied or internally generated; the latter can be voltage-controlled and modulated using FM.
The bottom section is independent, and functions as a balanced modulator of the applied signals. The degree of modulation is voltage-controlled, and the reference frequency can be internally generated or externally applied, as with the frequency shifter. A separate audio output is dedicated to classic ring modulation, a subset of balanced modulation.
All settings of the 285e can be stored and recalled as part of a preset using the 225e or the 206e Preset Manager."
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