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Radio
Broadcast Technical Consulting and Sales
10032 Island Drive, Brainerd, MN
56401
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Radio
Broadcast Technical Consulting and Sales |
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Technical Tips from Mark W. Persons |
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AM Coil Cleaning |
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After
many years of use, silver-plated coils can become very black with silver
oxide. The coil on the left is an E. F. Johnson, built in the 1950's or
1960's. The coil on the right is of the same vintage and looked
much like the left one, but has been cleaned. The coil surface is
not perfect, but is so much better than before the cleaning process. Coils are then ready for years more service in an AM transmitter, AM antenna coupling unit, or AM phasor. |
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We have
found that Muriatic Acid will do the job. Because the acid is
toxic, we do the work outdoors and use rubber gloves when handling the
coil in the acid bath. To do the work, the coil ribbon is removed
from its coil form and is put in a plastic bucket with about 2 inches of
the acid in the bottom. It takes about an hour to clean a coil
when the coil is turned every 15 minutes. Best to wash the coil in
a bath of water and baking soda to neutralized the acid and then rinse
well.
Muriatic Acid is available in well-stocked hardware stores for about $6.00 per gallon. |
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The stories go on and on.
Stop in again sometime. I'll leave the soldering iron on for you.
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page last edited 01/31/2010
