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API 312 500 Series Microphone Preamp , $795.00 - Add to Cart Skip to Product Information

API 312 500 Series Microphone Preamp

1-channel 500 Series Mic Preamp, Fully Discrete Circuit with 2520 Op-Amp, AP2516 Input Transformer, 3:1 Output Transformer Tap Selection, Analog VU Meter, and Peak LED Indicator
Item ID: API312
API 312 500 Series Microphone Preamp
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API 312 500 Series Microphone Preamp
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Juice Your Recordings With the Bold American Sound of API

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Our Product Research Team

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Huge, punchy drums, in your face. Beautifully open vocals, loud ’n’ proud, front-and-center. Big guitars, wide as a barn. This is the classic American sound of API. Countless iconic records were recorded through API consoles in the Golden Age of Analog, every mic pumped up larger-than-life through the legendary 312 microphone preamplifier outfitted on every channel. Today’s API 312 mic preamp is based on API co-founder Saul Walker’s original design, and it serves up that coveted analog warmth and girth, along with massive headroom. It’s the inimitable sound of API, and it fits right in your lunchbox.

API in your Lunchbox

The 312 500 Series mic preamp houses a modern production version of the vintage 312 circuit used in API consoles from the 1970s. API engineered today's 312 to be faithful to the original, right down to the smallest details. Built on a meticulous reproduction of Saul Walker’s original 312 PCB, today's 312 is a fully discrete design with API's storied 2520 op-amp, AP2516 input transformer, and a vintage-style analog VU meter and peak LED indicator.

API — the legendary American pro audio company

No American pro audio company is more iconic than API. Launched in 1968 by Saul Walker, Automated Processes Inc. began building quality consoles for broadcast applications. Soon, the company’s products found favor with recording studios, and a string of industry-leading innovations (including the 500 Series module, the first VCA, computerized console automation, and more) followed. API produced the 2520 amplifier, one of the most famous op-amps in the recording industry, and their consoles and products found homes in such iconic studio facilities as the Hit Factory, Record Plant, Ocean Way, Sunset Sound, and many others.

In fact, there are over 700 vintage API consoles around the globe — many of which are still in use. And the company certainly isn’t resting on its laurels; today’s API products give you the same unbeatable combination of utility, innovation, and great sound. That’s why, at Sweetwater, the name API commands reverence.

API 312 500 Series Microphone Preamp Features:

  • API’s classic 312 mic pre in a 500 Series module
  • Vintage-style analog VU meter; peak LED
  • 69dB of gain; switchable 20dB pad
  • Traditional API fully discrete circuit design with 2520 op-amp
  • Proprietary AP2516 input transformer
  • 3:1 output transformer tap selection
  • Switchable 48V phantom power
  • API 5-year warranty

Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

Extra peace of mind at no extra cost.

  • Save money with FREE parts and labor
  • Get back to making music with the industry's fastest turnaround time
  • Fix it the first time with our award-winning, factory-certified Service Department
Learn More about Total Confidence Coverage

Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

The estimated required monthly payment shown which excludes taxes and delivery equals the amount financed divided by the number of months in the promo period, rounded up to the next cent. During the last month(s) of the promo period the required monthly payment may be reduced due to this rounding. These payments apply only with the financing offer shown. If you make these payments by the due date each month, you should pay off this amount financed within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.

Applies only to select items from this manufacturer. Ask your Sweetwater Sales Engineer for more details.