I had ESL 63s for 25 years and loved them. I was a bit paranoid about arcing, and when I saw one spark while listening in the dark at high volume, I sent them off to Quad USA for assessment. They said no damage really, but they replaced the two middle panels on one of the speakers with the newer, white panels, just to be safe. The original panels were the black/copper ones, so they did not match the new ones aesthetically, but they all sounded fine together. Now, the interesting part: I sold them 2 years ago to a chap in Italy, and when they arrived, the white panels were not sounding right. I later discovered that the newer panels for some reason do not travel as well as the older ones, and shaking damages them. So, we found some older style panels which had been re-built, and the buyer installed them. Just be careful with shipping these things, as it is risky.
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