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"Excellent condition Buchla Dual Oscillator Model 258c from Roman Filippov kit. Meticulously assembled utilizing uA726s.
Two independent voltage-controlled oscillators, continuously tunable from 5 Hz to 20 kHz. Each has two processing inputs and a frequency modulation input. Waveshapes as well as frequency can be voltage controlled. Model 258 oscillators feature low sine wave harmonic content, negligible settling error, and high short and long-term stability, even with rapidly changing ambient temperatures.
Controls and I/O:
Processing inputs — Two processing control inputs permit multiple control of pitch without need of separate external processor.
Processing controls — Used to set desired range of frequency control. Expansion, compression, and inversion of scales are accomplished here.
Frequency modulation control — For adjusting vibrato depth or creating clangorous or bell-like tones, rich in non-harmonic partials.
Output — Signal amplitude is +4 dB. Output impedance is 600 ohms.
Oscillator frequency control — Spans the audio spectrum of 5 Hz to 20 kHz with no range switching. (Applied control voltages can extend limits to .1 Hz and 30 kHz.)
Waveshape control input — Waveshapes can be varied from sine to saw (osc 1) and sine to square (osc 2). Voltage control of waveshape enables powerful dynamic control of timbre."
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