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Buchla 258t Dual Oscillator

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Tiptop Audio and Buchla combine forces to present the 200 Eurorack series! In this project Buchla has teamed up with Tiptop Audio to resume the production of Don Buchla’s 200 series and convert it to Eurorack standards.

258t Dual Oscillator

Two independent voltage-controlled oscillators. Each has one processing input, a frequency modulation input and a 1V/oct 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.

Processing input:
The processing control attenuverter input permits control of pitch scaling/inversion/expansion without the need for a separate external processor.

Frequency modulation control:
For adjusting vibrato depth or creating clangorous or bell-like tones, rich in non-harmonic upper partials.

Processing control:
Used to set desired range of incoming control voltage for expansion, compression and inversion.

1V/Oct input:
Control Voltage input for 1V/oct note tracking.

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.

Oscillator frequency control:
Spans the audio spectrum of 5 Hz to 20 kHz with no range switching. (The original graphic 5cps to 20kc was only intended and noted to be approximate.)

Size: 18HP

Depth: 45mm

Power: +12V 70mA / -12V 40mA

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