Buchla 207t Mixer/Preamplifier User Manual

: June 16, 2024
: Buchla

Table of Contents

Buchla 207t Mixer/Preamplifier
Product Information
Product Usage Instructions
MIXER/PREAMPLIFIER – MODEL 207t
Specifications
Documents / Resources
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)

Buchla 207t Mixer/Preamplifier

Buchla-207t-Mixer-Preamplifier-product-image

Product Information

Specifications

Size: 28 HP
Depth: 28mm
Power: +12V 90mA / -12V 85mA
Eurorack 200 series

Product Usage Instructions

Microphone Input
The Buchla 207t mixer features a microphone input with a preamplifier and gain pot. The microphone input jack accepts a 1/4 TRS phone plug. The gain switch and knob located above the microphone input set the gain of the preamp. The switch has two different ranges, 55db and 70db, to accommodate most microphones that need to be boosted to Eurorack signal levels. The microphone input can also be used for a signal from other sources such as an electric guitar or line level electric piano.
Mixer Signal Inputs
At the bottom of the mixer are six signal input jacks labeled ‘A’ through ‘F’. These jacks are used to connect external audio sources to the mixer.
Monitor Output
Above the signal input jacks are six yellow MONITOR switches. When any of these switches are in the up position, the signal from the corresponding input is sent to the MONITOR output on the mixer. The MONITOR output allows for monitoring the individual input signals.
Main Signal Outputs
The mixer has two main SIGNAL outputs. Above the MONITOR switches are six blue switches. When any of these switches are up, the respective signal is sent to the main SIGNAL outputs. The sliders located next to the blue switches are attenuators for the input signals going to the SIGNAL outputs. They do not affect any signals going to the MONITOR output.
Signal Assignment and Panning
Above the four center sliders are ASSIGNMENT pots which pan the signal between the left and right outputs. The input channels on either side of each mixer (A and F) feature voltage controlled assignment. By default, without any control voltage, channel A is assigned to the left output and channel F goes to the right output. As the control voltage increases, the signal pans to the other output channel. The two LEDs below each control voltage input indicate which channel the signal is going to.

Frequently Asked Questions

Q: What is the power requirement for the Buchla 207t mixer?
A: The mixer requires +12V with a current of 90mA and -12V with a current of 85mA.

MIXER/PREAMPLIFIER – MODEL 207t

Above the four centre sliders are ASSIGNMENT pots which pan the signal between the “left” and “right” outputs. The input channels on either side of each mixer (“A” and “F”) feature voltage controlled assign. Without any control voltage channel “A” is assigned to the left output and channel “F” goes to the right output. As a control voltage increases the signal pans to the other output channel. The two LED’s below each control voltage input indicate which channel the signal is going to.
On the top right of the mixer, is one “left” channel output jack, and one “right” channel output jack, two mono MONITOR outputs, and one stereo EXPANSION IN jacks. These last two jacks are actually a pair of inputs without attenuators, assign control, or access to the MONITOR output. The jack on the left goes directly to the “left” output and the left right goes to the “right” output. These inputs can be used to link the two mixers to form one 12 in, 2 out” mixer. To do this simply patch the SIGNAL outputs of one mixer into the EXPANSION IN inputs of the other.
Above these are six yellow MONITOR switches. Putting any of these switches in the up position sends the signal from that input to the MONITOR output on the mixer. The six blue switches, when up, send the respective signal to the main SIGNAL outputs. The sliders are attenuators on the input signals going to the SIGNAL outputs. They have no effect on any signal going to the MONITOR output.
At the bottom right side of the mixer is a microphone input with preamplifier and gain pot. The microphone input jack takes a 1/4” TRS phone plug. Above it is the gain switch and knob which set the gain of the preamp. The switch has two different ranges, 55db and 70db to cover most microphones that needs to be boosted to eurorack signal levels. The microphone input can also be used for a signal from some other source such as an electric guitar or line level electric piano.
Horizontally on the bottom are the six mixer signal input jacks (‘A” through “F”).