TipTop Audio 258T Overview

Generate complex waveforms with the Tiptop Audio Buchla 258t Dual Oscillator, with two independent voltage-controlled oscillators, a processing input, a frequency modulation input, and a 1V/oct input. Waveshapes and frequency can be voltage controlled. Model 258t oscillators feature low sinewave harmonic content, negligible settling error, and high short and long-term stability, even with rapidly changing ambient temperatures. The module ships with a ribbon power cable.

Trimmers

There are four trimmers for each oscillator on the back of the module:

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 sinewave.
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 sinewave purity.
From version V1.2 two more trimmers were added. VPP1 and VPP2 are used to set the waveshape amplitude.

Eurorack Ready

18 HP Eurorack format module
Maximum depth: 1.8" (45mm)
Includes power ribbon cable with Eurorack power headers
Power consumption: +12V: 70mA, -12V: 40mA

In the Box

TipTop Audio Buchla Model 258t Dual Oscillator Eurorack Module (18 HP)
Ribbon Power Cable
Limited 1-Year Manufacturer Warranty

User Manual

6.5 MB

TipTop Audio 258T Specs

Key Specs

Sound Generation	Analog
Audio I/O	4x 1/8" / 3.5 mm Output
MIDI I/O	No
CV/Gate I/O	8x 1/8" / 3.5 mm CV Input
Patch Points	8x 1/8" / 3.5 mm Input 4x 1/8" / 3.5 mm Output
Eurorack Current Consumption	70 mA on +12 V Rail 40 mA on -12 V Rail
Horizontal Pitch	18 HP

General

Item Type	Eurorack Module
Sound Generation	Analog
Expression Controls	No
Number of Pads	No
Built-In Effects	No
Performance Functions	No
Built-In Speaker	No

Synthesis

Oscillators	2x Variable (FM, Sawtooth, Sine, Square)
Mixer	No
Amplifiers	No
Envelopes	No
Filters	No
LFOs	No

Sequencing & Recording

Sequencer	No
Arpeggiator	No

Connectivity

Audio I/O	4x 1/8" / 3.5 mm Output
MIDI I/O	No
CV/Gate I/O	8x 1/8" / 3.5 mm CV Input
Control Voltage Level	CV In: +12 V (1 V/Octave)
Patch Points	8x 1/8" / 3.5 mm Input 4x 1/8" / 3.5 mm Output
Sync I/O	No
Media/Memory Card Slot	No

Audio Performance

Frequency Response

5 Hz to 20 kHz

Power

Power Requirements	Eurorack Power
Eurorack Current Consumption	70 mA on +12 V Rail 40 mA on -12 V Rail

Physical

Horizontal Pitch	18 HP
Included Accessories	No

Packaging Info

Package Weight	0.745 lb
Box Dimensions (LxWxH)	6 x 4.7 x 3"

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TipTop Audio Buchla Model 258t Dual Oscillator Eurorack Module (18 HP)