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10 Vintage API 550A EQ Modules w/ Aphex PSU & Chassis Owned by Neil Young #32825

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About This Listing



MODEL: 550A, PS3

FUNCTION: 10 EQ Modules in 500 Series Rack Chassis with a Power Supply

PRODUCT DESCRIPTION: This listing is for a bundle of 10 Vintage API 550A EQ Modules housed in a 10 slot rack chassis. These units can be powered by the Aphex PS-3 unit which is included.

All of these items were owned and used by Neil Young! These rack of API's was recently auctioned off as part of Neil's personal gear collection here in Los Angeles. We were lucky enough to win them and are now passing them on to some lucky new owner. 

In the above photos a sampling of a few module internals were taken to show details. We have photos of every module but the listing will only allow so many. If you require detailed photos of every module, please email us and we will provide them. 


  • Each Module features TWO 2520 Op Amps!
  • Two of the modules have had their 2520's replaced with Avedis Op Amps. 
  • Consecutive serial numbers!
  • 550A Module Serial No. 106, 107, 108, 109, 110, 111, 112, 113, 114, 115
ACCESSORIES INCLUDED: These items include a power cable. This item comes only as seen in photos, and does not include any other accessories.

  • Aphex PS-3 Power Supply
  • 10 Slot 500 Series Rack Chassis
PHYSICAL CONDITION: Very Good - Rack rash scratches can be found about the chassis, but no damage or major blemishes. The modules themselves are in terrific condition. No broken or missing parts, toggle switches are all intact all buttons as well. PSU has some tape residue on its chassis but is otherwise in excellent shape. Overall condition is very good!

Excellent - Each module has been tested with great success, all bands and all functions operate perfectly. Filters, LED indicators, and all I/O connections are in excellent working condition. These units would make a great addition to your studio. Keep on rocking' in the free world!

NOTE: Some of the modules have previous notes of service or issues. None of the issues mentioned on the modules were found on the modules in their current state during extensive testing. The service history is unknown on these modules but in our care, they have found to be operating great in all channels with an even response throughout. 



Product Specs

Listed3 years ago
ConditionVery Good (Used)
Very Good items may show a few slight marks or scratches but are fully functional and in overall great shape.learn more

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