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"Rare Buchla Original Dual Oscillator Model 258.
Historical Vintage Series 200 Synth System.
Dimensions approx. 7.5" x 4" x 3"
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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