X-12mk500 Mic Preamp

The FiveFish Audio X12-mk500 Mic Preamp is a single-channel Mic Preamplifier, designed for the popular API VPR500 Rack format.

This preamp delivers a big, aggressive, mid-forward sound, reminiscent of that 70's L.A. Sound. A USA made Mic Input Transformer adds the right sonic flavor to your recording and a custom USA-made Output Transformer takes care of balancing the beefy outputs, and also adding it's own sonic signature.

This pre is perfect for rock, and aggressive music! The smooth high-end response of this preamp also makes it a great multi-purpose preamp, excellent for use in other sources like vocals where it delivers the right amount of "angst" and rawness to your vocals. Bring back the golden age of rock with the X12 preamp!


Gain control is provided by a high-quality Mil-spec Grayhill 12-stepped rotary switch, and a separate Output Trim knob gives you fine control over this preamp. Lighted push-button switches gives a visual indicator of the status of your preamp even from far away. It also features 48V soft-start phantom power, that applies 48Volts gradually to avoid any loud popping sound when you turn on Phantom Power. There are also -20db Pad and Polarity Reverse function, provided by a switched Relay.

An ultra-low distortion, low noise, operational amplifier optimized for high performance audio is used in the circuitry. But you can also outfit the X12 Mic Preamp with optional Discrete Op Amps* (DOA) 2520/990 type, and DOA sockets*.


FiveFish Audio and the X-12mk500 Mic Preamp is part of the API VPR Alliance.

The VPR Alliance is a program of standardization and consistency guidelines set by API Audio for manufacturers, to make our products physically fit and electronically conform to API's 500 series rack specifications. As stated on API's website, "Customers benefit from the VPR Alliance through the elimination of any confusion as to which products are endorsed for placement in API racks. Customers also benefit from a wider range of module choices for their racks, safety in the knowledge that the specification of the third party unit is correct, and that there is no risk of damage occurring. "


  • API VPR Alliance approved, 500 Series Rack Format*
  • Made in USA, Input Transformer
  • Made in USA, Output Transformer
  • 12-step Gain from 22dB to 68dB, at 4dB/step
  • Output trim control
  • LED-lighted push buttons for 48V phantom, pads, and polarity reverse switches
  • Relay Controlled Polarity Reverse
  • Relay Controlled -20dB Pad
  • Soft-start/Ramp-up 48V Phantom Power
  • 5-LED VU Meter
  • Using high-performance chips, and quality components
  • Option to use Discrete OpAmps with the 990/2520 format

* The X-12mk500 Preamp requires an API 500 Series Rack or compatible rack.

For USA Buyers

For INTL Buyers





$60 - Discrete OpAmp + Mill Max Sockets installed
Mill Max sockets and Discrete OpAmp installed

$15 - Set of Mill Max sockets installed
if you plan on installing Discrete Op Amps in the future.

$10 - Set of Black Knobs

$50 - Custom Color Panel
Email us with your color preference.



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Audio Samples