Buchla x Tiptop Audio Model 258t Dual Oscillator Eurorack Module

Experience The Legendary Buchla 200 Series Revived with the Buchla x Tiptop Audio Model 258t Dual Oscillator Eurorack Module

Buchla has teamed up with Tiptop Audio to resume the production of Don Buchla's 200 series and convert it to Eurorack standards. These extremely rare pieces of equipment made almost half a century ago will once again be available, and this time to a wide audience. Each module will be produced separately as production schedules and component availability allows.

The Model 258t is a careful Eurorack recreation of Buchla's "Dual Oscillator 258" module, a 70's classic and a defining piece of the brand's legacy. It features 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. To best deliver the Buchla sound, the Model 258t keeps the original 258's distinct low sine wave harmonic content, negligible settling error, and high short and long-term stability - even with rapidly changing ambient temperatures.

Inputs, Outputs, and Controls

• Processing Input - The processing control attenuverter input permits control of pitch scaling/inversion/expansion without the need for a separate external processor
• 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
• 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
• Oscillator Frequency Control - Spans the audio spectrum of approximately 5 Hz to 20 kHz with no range switching

Trimmers

• 1V/oct is the octave tracking trimmer and is set at the factory using high precision instruments
• SHAPE is the trimmer that set the sine wave, for the lower harmonic content of the sine wave
• VC WAVE SHAPE sets the response of the waveshaper to the incoming control voltage. Both SHAPE and VC WAVE SHAPE trimmers are used to adjust the sine wave purity

SPECIFICATIONS

• Size: 18HP
• Depth: 45mm
• Power: +12V 70mA / -12V 40mA

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