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Re: ESL 63 suddenly fading???!!

Posted by kentaja@yahoo.com (M) on November 16, 2006 at 07:50:50

In Reply to: ESL 63 suddenly fading???!! posted by Mickey Bob on November 15, 2006 at 21:03:44:

This is a sign that one or more panels in that speaker is going bad. At times, leakage on the panel(s) becomes excessive and pulls down the sensitivity. Typically, but not always, if you look at the offending speaker in a dark room, with the grille cloth down, you will see some faint twinkling or corona on the offending panel(s).

You can also confirm a leaky panel by pulling the little round rubber boot on the back of the speakers. This is located right above the on/off switch. When the panels are working normally the flasher unit should blink every few seconds. When the panel(s) starts to leak and the sensitivity drops the flasher will be lit continuously. When the leakage stops and the sensitivity returns to normal you will see the flash rate return to every few seconds.

Unlikely it is the EHT board. When they go bad the sensitivity drops and does not return.

I am not aware of anyone in the Dallas area that performs repair work on Quads. Galen Carol Audio in San Antonio has been an authorized dealer for many years and may do repair work. I do rebuild panels and Wayne Picquet in Longwood, FL is another rebuilder that does excellent work. QS&D in Virginia can supply you with new factory panels. You might have to ship the speaker for repair or find someone locally that can remove the offending panel(s) for repair.

In the short term, running them at slightly lower SPL levels will keep the leakage in check and maintain the sensitivity.

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