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$ 755 .25
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API 312 500 Series Discrete Microphone Preamp

API's classic 312 microphone preamp in a 500 Series module featuring a discrete circuit design with 2520 Op Amp and proprietary AP2516 input transformer

MFR# 312

Product Description

The API 312 has long been known as one of the most important preamps in recording history. In 2019, API Audio celebrated its 50th anniversary with a limited edition run of the mic pre, but in 2020, the brand is bringing the 500 Series module back to regular production.

This standard production version of the API 312 is based on the original design of company co-founder Saul Walker. The fully discrete circuit design uses 2520 op-amps and proprietary AP2516 input transformers to get that familiar sound of 1970s American rock records with lots of warmth. Following in the footsteps of the limited run of the 50th Anniversary Edition, the new API 312 features a beautiful vintage style analog VU meter, in addition to a 20 dB pad switch and peak LED. The 500 Series module also offers a maximum 69 dB of gain.


  • API's Classic 312 Microphone Preamp in a 500 Series module
  • Vintage Style Analog VU Meter
  • Maximum 69 dB of gain
  • Traditional API fully discrete circuit design with 2520 Op Amp
  • Proprietary AP2516 Input Transformer
  • 20 dB pad switch
  • 3:1 Output Transformer Tap Selection
  • Switchable 48V phantom power
  • Peak LED
  • API’s Five Year Warranty

Product Specifications

Condition New
Tube or Solid State Solid State
Chassis Module
Module Type 500 Series
Module Slot Count 1 Slot

Product Reviews

5 out of 5 stars.
Review Count (5)

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Favorite Preamp.!.!.!
This is my 2nd one…
Love it… can’t be beat for drums… I love it on vocals and everything I run through them…
API gets used all day long vs my other Neve UA Daking etc…
Amazing Preamps.!.!!

By John K on January 3, 2023

Lots of headroom and plenty of punch. I love how my ‘65 Gibson J-45 sounds through this mic pre. Transparent, smooth and present. Best piece of gear under a grand that I have ever bought.

By John M on January 29, 2021

Nice piece,souds great

By dan s on November 5, 2020

If I ever buy a console it’s going to be API. I have tried pretty much every preamp known to mankind and this is absolutely my favorite. Pair it with a Manley ELOP and float in sonic bliss.

By Steve H on October 29, 2020

Good sound! I love it.

By Renato on September 27, 2020

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The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
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