Melcor / MAP AM-27 / AML-27 API 500 Format Microphone Preamps 1970's

Vintage API 500 Preamp Bundle – M.A.P. AML-27 + (2) Melcor AM-27 w/ GAR 1731 – Radial Workhorse Cube

Up for sale is a unique, compact, and great-sounding vintage high-end preamp rig, adapted to API 500 format and installed in a Radial Workhorse Cube.

Included:

• (1) M.A.P. AML-27 preamp (original output transformer and op amp + UTC O-9 input transformer)
• (2) Melcor AM-27 preamps (original transformers + GAR 1731 replacement op amps)
• Radial Workhorse Cube 3-slot 500 series lunchbox

These circuits are widely considered to be precursors to the classic API 312 preamp design, sharing a very similar discrete op-amp, and transformer-balanced circuit that helped define the punchy, forward “API sound.”

All three preamps have been professionally converted to API 500 series format, making them far more usable in a modern workflow.

All modules feature:

• Input pad
• Phantom power
• Polarity (phase) switch
• Direct input (DI)
• Output level control (variable)

Control differences:

• M.A.P. AML-27: stepped gain control
• Melcor AM-27s: continuously variable gain controls

Everything is in excellent working condition and ready to use.