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The Chandler Limited Germ 500 MKII Pre Amp is a one-unit pre amplifier designed to be mounted in an API 500 Series-style lunchbox. The device's components were re-designed from the original rack version to work with API's lower-voltage power standards and connectivity requirements.


The pre amp features Germanium transistors in Class-A transformer-balanced circuits. The sonic benefits of Germanium transistors are that they exhibit the firm tonality of a solid-state circuit combined with the warm and smooth harmonic distortion characteristics of a tube.


The XLR microphone input, signal output, and power connections for this device are built into the lunchbox rack enclosure that the module plugs into. For direct input, the pre amp also includes a switchable 1/4" TRS instrument connection on the front panel.

The Features

Gain/Germanium Drive Knob

In 3 dB increment steps, the Gain knob interacts with the Feedback knob to change the signal tonality. Driving the gain will accent the low frequency and provide a thicker-sounding tone


Feedback Knob

- Adds feedback to the signal that subsequently changes the total harmonic distortion, frequency response, and gain of the signal, adding color, thickness, and brightness to your tone


Direct In/Unbalanced In

An unbalanced input jack for guitar, bass, and other instruments. A switch changes the input from a direct in to a microphone input


Pad Button

Allows you to run Gain and Feedback controls close to the maximum to increase low-end response and add harmonic distortion


Thick Button 

Adds a low-frequency rise to the signal, making the tone warmer and rounder


Phase Switch

Reverses the polarity of the output


Phantom Power

On/Off switchable 48 V of phantom power



The unit has been proven to work with the following racks 

API 500V 10-slot with L200 PSU

API 500-6B Lunchbox

API 500-6B HC "new version" Lunchbox

BAE 11-slot with power one supply

BAE 6-slot portable with power one supply

BAE 6-slot with Avedis-designed supply

A-Designs 2-slot

Purple Sweet 10

Empirical Labs 2-slot


Chandler Limited is the only company in the world authorized to develop, manufacture and market the “Official Equipment” of EMI/Abbey Road Studios.

Chandler Limited and their associated logos are registered trademarks of Chandler Limited, Inc. Abbey Road Studios, EMI, TG, REDD and RS and their associated logos are trademarks of EMI (IP) Limited.


Chandler Limited Germanium 500 Preamp MKII

  • Chandler Limited 500 Series Germanium Preamp MKII
  • 500 Series microphone preamp
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