Since so many of Quad ESL 63 or USA monitor have panel replaced by OTA or others. Is still possible to buy one without panel repalcement record. I am worry sound may change or mis- match of panels.
I've owned the 63's for a long time now and you have nothing to fear from replaced panels as long as they were done by someone who knows what they're doing. I've used QS&D and Quads Unlimited and both did a good job. The basic fact of Quads is that the panels age over time and will need to be replaced - fear not.
Panels last 15-20 years if you take care of them, if your touchy then 10 years and send them in for a check up. To many myth about these speakers.
100,000 of thousands in service still, amps and there ability to drive them has improved over the many years. Abuse them and like any speakers you can have issues.
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