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1994 API 550b 4-Band 500-Series EQ w/ Blue & Silver API 2520 Op-Amps #53039

Availability: In stock



WORKING CONDITION: Excellent - This EQ is in excellent working condition. The bands can be a bit scratchy at times, however this does get resolved with a bit of exercise. This is in excellent working condition.

PHYSICAL CONDITION: Excellent - This EQ is in excellent physical condition. The "In" button is discolored, but otherwise the faceplate is extremely clean and shows very few signs of wear for the age of the EQ. This is in excellent physical condition.



MODEL: 550b

FUNCTION: 500-Series Equalizer

PRODUCT DESCRIPTION: This listing is for an API 550b 500-series equalizer.

This very unit in this listing was used in Studio 1 of Sunset Sound for many years, see pics. 


  • Serial #1091
  • API blue/silver 2520 op-amps
  • AP2503 output transformer

ACCESSORIES INCLUDED: This item comes as seen in photos and does not include any accessories.


UNPACKAGED DIMENSIONS: 7" x 1.5" x 5.25"

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