Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

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RE: Cleaning that Harman Kardon Copper

Posted by Br3098 on July 11, 2020 at 08:57:02:
THere used to be a product called Tarn-X that was supposed to be a wipe-on product for silver and copper. I haven't seen it in years but I believe it's still available.

The face plate is not pure copper but a copper/tin wash. It was supposed to be resistant to corrosion. If it's tarnishing now (as opposed to just being dirty) your cleaning it is just going to cause it to re-tarnish pretty quickly. If you can get it pretty clean you might want to spray a clear lacquer over it. Remove the top cover, knobs and mask off the pots, switches and mask all areas you don't want sprayed. Spray very lightly; two thin or more thin coats are better than one glob (technical term).

I would avoid anything that requires scrubbing or especially buffing if you want to have any chance to preserve the lettering.