2x Vintage API 550A 500 Series Equalizers. Three SN apart. 550 A. - $5,000 (Yuma)

2x Vintage API 550A 500 Series Equalizers. Three SN apart. 550 A. 1

2x Vintage API 550A 500 Series Equalizers. Three SN apart. 550 A. 1 thumbnail

condition: excellent

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This pair of vintage API 550A equalizers is in great original shape. They work great and have no issues. These units have minor scratches and stains. Thats something to expect from 50 years old units.

Their serial numbers are 3503 and 3507 and they were manufactured in Melville, NY in the 1970s. They have still the original opamps. Circuit is original, no mods.

post id: 7906611512

posted: 2026-01-05 06:48

updated: 2026-02-13 07:37

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2x Vintage API 550A 500 Series Equalizers. Three SN apart. 550 A. -...

This pair of vintage API 550A equalizers is in great original shape. They work great and have no issues. These units have minor scratches and stains. Thats something to expect from 50 years old...