[Milsurplus] Cleaning FT-241 surplus LF crystals and other things

[Bruce Gentry]

After many years of removing "crud" from crystals, meters,  and other 
sealed or enclosed parts, I wanted to share this.  Most contaminants are 
the result of outgassing or deterioration of plastics and rubber. These  
seem to be dissolved and removed by either alcohol or acetone, 
hydrocarbons, or water. Usually, the unwanted deposits will only be 
removed effectively by one of these solvents, sometimes all three have 
to be used with water being the last. In addition to sealed items, we 
have all encountered equipment of many kinds that were fouled with 
almost anything you can imagine. One of my most challenging but also 
successful and rewarding projects was an Ampex tape deck that had been 
stored in the basement of a greasy spoon diner with troublesome plumbing.

       Bruce Gentry, KA2IVY


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> Jersey City, NJ
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