Alctron MP73a

Alctron MP73a is a pre-amp for the 500 series, manufactured by Alctron.

History
The Alctron MP73a was released in 2016.

Official description
Introduction

The MP73a is a 500 Series microphone preamp it is a one-channel vintage style microphone, line and instrument preamplifier. The signal path uses only discrete components like resistors, capacitors and transistors. The microphone and line input and the line output are transformer balanced, using two different transformers, each one optimized for its purpose. Great use for guitars, bass, keyboards and other instruments.

The circuit used in the MP73a is similar to the preamp section in the classical 1073 module with a cor- responding sound character that is warm, punchy, sweet and musical. These classic characteristics have been heard on countless recordings through the years and it is a versatile sound that works very well on most sound sources and in most genres. The essence of this sound is now available at a surprisingly low cost, making it available to nearly everyone.

Specifications
 * Vintage Style electronics, no integrated circuits in the signal path
 * Transformer balanced, fully floating output
 * Enough microphone gain to handle passive ribbon microphones with quiet sound sources
 * Total gain range from -15 to +80 dB
 * Switchable impedance on microphone input, 1200 or 300 ohms
 * Switchable phantom power with a LED indicator
 * A flexible front panel instrument input for additional sound sources
 * Make fine gain adjustments and overload the main gain stage(s) for more character
 * Phase switch
 * Selectable AIR equalizer adds a small boost above 10 kHz
 * Selectable 600 ohm Output Termination at the back of the module
 * Compatible with 500 series rack formats
 * 48 volt Phantom Powe