This Vintage API 550A-1 is in great shape. It was manufactured in the Huntington, NY API facility back in the 70s. It was recently inspected and had switches and knobs cleaned. All bands and filter work fine. This unit sounds great. I have a few units like this one at the moment. You can send me a message if you are interested in more than one unit. This is the unit number 3.

For those not familiar with the 550A-1, this unit is very similar to the 550A with a few differences:

- use of ICs in the circuit

- singe 2520 Op Amp instead of two.

- constant Q

- balanced input (instead of unbalanced)

These units use the same 550A faceplate, which sometimes can be confusing.


I ship worldwide.

Pick up in Nashville available.

Listed10 days ago
ConditionExcellent (Used)
Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.Learn more
Brand
Model
  • 550A 500 Series 3-Band Equalizer Module
Finish
  • Black
Categories
Year
  • 1970s
Made In
  • United States

Product safety information may be available here.

Top Track

Nashville, TN, United States
Joined Reverb:2015

Reverb Protection

Simple Returns, Secure Transactions, Human Support

Learn more

Secure Checkout

Promoted similar listings













Product reviews

Reverb Gives

Your purchases help youth music programs get the gear they need to make music.

Oops, looks like you forgot something. Please check the fields highlighted in red.