Quad esl 57 panel rebuild problems

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So I ran into some problems trying to rebuild my 57s.

I started with a bass panel that showed serious humidity damage. The screws for the EHT connection were completely corroded and I couldn't get them out. The carbon in the two centre ribs is stained and seemed to come off very easily. The aluminum around the edge was completely oxidized in places.

What I did was, drill two new holes for the EHT. Use aluminum tape with conductive adhesive to connect the EHT to the outer aluminum and repair the oxidized aluminum. Continuity checks confirmed that I was making a connection. Then I rediaphragmed and coated with elvamide, bolted it back together.

The result is a very very quiet panel.

I am hoping someone has suggestions. I'm going to try using a commercial coating and trying again but I'm worried that the connection to the aluminum might be the problem and the loss of conductive carbon.
 
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