In Reply to: ESL-57 Bass Panel Degradation posted by Hey You on December 7, 2006 at 09:06:08:
...problem. The major difficulty being the detection of those "sputtered" metal areas that were not present when the speaker was built. I can think of an "extreme" makeover solution that will work, but it means taking the stator back to the plastic (nearly) and having conductive paint (a lot) available to re-coat the tracks that carry charge to the diaphragm.OK, here goes. Remove the paint from the entire stator with the usual fine sanding methods or even rub the paint that is still adhering well (after 30 years?) off with acetone - very carefully!! This will not remove the metallic spots though I wouldn't think. Then immerse or otherwise cover the surfaces of the stator in a weak acid (e.g. straight white vinegar) and leave them for a few hours. This should dissolve the metal spits and spots leaving the PVC stator unaffected. It might reveal the spots - some "fizz" may be apparent. If so, it's Hydrogen gas, so no naked flames, please! It is possible that this will affect the conductive tracks a little - although in the treble panel these are carbon and that shouldn't (theoretically) happen.
Rinse, dry, (perhaps fill small defects) and re-paint. Whew!
Regards,
Gary Jacobson
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Follow Ups
- This is a very thorny... - Gary Jacobson 17:20:31 12/10/06 (0)