Determining the age of the Quad ESL

Planar Speaker Asylum

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Is there a way of determining the year of manufacture of the Quad ESL from the serial numbers. I had a pair with serial numbers 55XXX and was quite certain they were made in the late 70s or early 80s, probably just before they stopped production.

Thanks!
Terry

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Parts Connexion

Topic - Determining the age of the Quad ESL - Terry 13:29:10 05/31/20 (7)

Thank you! - Terry 17:11:22 05/31/20 (0)

RE: Determining the age of the Quad ESL - kentaja 14:20:03 05/31/20 (1)

RE: Determining the age of the Quad ESL - Zombie 09:07:06 06/01/20 (0)

RE: Determining the age of the Quad ESL - 13th Duke of Wymbourne 14:19:35 05/31/20 (3)

Duke or anyone - Story 04:52:23 06/01/20 (2)

RE: Duke or anyone - 13th Duke of Wymbourne 12:27:36 06/02/20 (1)

ah yes - Story 14:07:21 06/02/20 (0)

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