0% up to 48 Months on over 110 Brands!

New & Current Vintage King Card Holders

Looking for something that will be a similar fit in your studio? Contact us, chat with us, or call us at 888.653.1184.

API 862 Mic Preamp/EQ #48 (Used)

Handwired 312 and 550A in a 19" rack unit. Limited edition of 50.

Product Description

The API 862 is a limited run microphone preamp/EQ celebrating API's 50th anniversary. The 312 preamp and the 550A EQ are combined in a single, hand-wired 19-inch rack-mount unit. These special limited edition units are painstakingly hand-assembled, paying homage to the golden era of analog recording. The limited-production 50th-anniversary faceplate gives each unit a sleek, elegant feel.

312 Preamp

The 312A preamp section is a faithful reproduction of the original 312 microphone preamp, utilizing Saul Walker’s original design from the 1970s. One of API’s most popular mic preamps, used extensively in their consoles, as well as the highly successful 3124 rack unit, the 312 is known for its bright, open, punchy sound. It has been a go-to preamp for engineers recording drums, rock guitars, bass, vocals and more.

The API 312 is capable of withstanding blisteringly high SPLs, making it an excellent choice for heavy-hitting drummers, screaming guitar amps, and particularly emphatic vocalists. Don’t worry though, the peak LED indicator will help keep you from clipping – or intentionally drive signals for added saturation.

550A EQ

The 550A EQ section is a near-identical reproduction of the legendary 550A 3-band equalizer designed by Saul Walker in the late 60s. The original 550A equalizer became API’s standard channel module EQ when the company began manufacturing consoles in 1971. Known for its bright, open, punchy sound, the API 550A EQ has been used on countless hit records over the decades. The 550A is equipped with API’s incomparable 2520 op-amp and innovative "Proportional Q" circuitry.

With 21 points of reciprocal equalization divided into three overlapping ranges, the 550A is capable of creating truly unique filter shapes. For added versatility, the high and low-frequency ranges can be used as peak or shelf filters. Frequency ranges and boost/cut are selected by three dual-concentric switches, and a pushbutton "in" switch allows the EQ to be silently introduced to the signal path.


  • 35 dB of adjustable microphone input gain
  • Polarity flip, 48 V phantom power, and 20 dB pad switches
  • Insert switch to activate rear EQ input connection for 550A EQ section instead of 312 output
  • 3 bands of EQ in discrete steps to a maximum of 12 dB boost or cut and 5 frequencies per band
  • 550A EQ IN switch
  • High and Low bands shelf/peak selection switches
  • Switchable band pass filter toggle switch
  • Vintage style analog VU meter (0VU = +4 dBu) and peak LED (+18 dBu), selectable 312 or 550A output

Product Specifications

Condition Used / Vintage

Product Reviews

No one has written a review yet. Be the first!

* Required Fields

Share Your Opinion

The best gear advice always comes from those who use it the most. That's where you come in! Let the pro audio world hear your voice with a review of the API 862 Mic Preamp/EQ #48 (Used) . Once you submit your review, please check your email and verify your address to have it posted.

How do you rate this product?
I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.
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.
James P.
Thank you so much! Vintage King has been so fair and easy to work with. I can't thank you enough. It feels good to trust such a hefty purchase to folks who are so helpful and knowledgeable. Vintage King is a sound designers dream store.
Noa L.
You guys have excellent customer service and I am excited about the next upgrade I complete on my fifth recording facility. I've been in the studio business for forty plus years. The salesman I worked with at Vintage King was the best of the best. You all rock!
Robby T.
I would recommend Vintage King to any one looking for top-class gear, unbeatable customer service and the best prices on the map!
Jake D.
My experience with Vintage King was excellent. The order was here fast considering it was out of stock. The sales person had SKB send it to me directly and I couldn't have been more pleased.
Michael D.
From the minute I placed my order I was kept well-informed through each step in your process. Even though I was buying a comparatively modest piece of gear, your attention to detail made me feel like I was purchasing a six-figure mixing desk.
Thomas W.
I am a new customer of yours. You guys provided me the absolute best deals in ordering all the equipment to power my brand new recording studio. Your customer service is amazing and i will always deal with you from here on out.
Rob M.
Thanks for your great service and getting this out today. You guys really are the Kings!
Alan B.
Better than expected! Truly impeccable service. Your team was professional, knowledgeable, provided speedy delivery above and beyond standard. Vintage King Audio is definitely my go to for all of my audio and information needs.
James O.