Chameleon Labs 7681 Owner's Manual

Chameleon Labs

Model 7681

Discrete Class AB Microphone Preamplifier

Module

Owner’s Manual

704 228th Avenue NE, # 826

Sammamish, WA 98074

206-264-7602

www.chameleonlabs.com

Revision A May, 2010

Your Model 7681 microphone preamplifier card has a transformer
balanced input with a gain range of +25dB to +80dB.

The Model 7681 has been carefully constructed and individually
tested for quality. It utilizes class ‘AB’ circuitry. This unit is
made with 100% discrete components and was fabricated to
precisely match vintage counterparts manufactured in the early
70’s.

The Chameleon Labs Model 7681 is based on high audio
performance design techniques. By employing classic circuit
design, polystyrene capacitors, hand selected components and
custom wound transformers, Chameleon Labs ensures that the
Model 7681 will exhibit classic audio sound. It is also designed to
comply with any 500 series powered chassis approved by the

®

API

VPR Alliance.

Your Model 7681 represents a dramatic breakthrough in
delivering vintage audio performance at an affordable price.

Features of the Model 7681:

• Fully balanced transformer mic input which can be

upgraded to a vintage Carnhill® unit;

• Transformer balanced output;

• 300 Ohms or 1.2K Ohms mic input impedance selectable on

the front panel;

• 48VDC phantom power selector on the front panel;

• 12 position Grayhill® gold contact rotary gain switch for

Mic gain section;

• LED illuminated push buttons for visual confirmation

• Output level control functions as a fader when going straight

to D.A.W. or tape;

• API® 500 series compliant card;

• One-year warranty