via this auction
"Rare Buchla Original Frequency Shifter/Balanced Modulator Model 285.
Historical Vintage Series 200 Synth System.
Dimensions approx. 7" x 4" x 3"
Shifts frequencies contained in input signal by an amount equal to externally applied or internally generated reference frequency. Internal reference generator is voltage-controlled, frequency-modulated, and provides the capability of continuous shifting through zero. Raised and lowered frequencies are simultaneously available. Unit incorporates a separate, voltage-controlled, balanced modulator, providing continuous transition from unmodified to amplitude-modulated and ring-modulated signals."
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