> I recently returned to the air after an eight year absence. The
> roller inductors in my Nye MB-V-A and my Ten Tec 4229 antenna tuners
> have corroded and are intermittent. I have squirted contact cleaner
> on the coils and rollers and run the rollers back and forth with no
> improvement. Does anyone have any suggestions?
> 73, Hank, W6SX
> Mammoth Lakes, California
The RCA manual for their AT3 transmitter (WW2) recommended a mixture of
anhydrous lanolin and carbon tetrachloride as a lubricant for the roller
I still have some anhydrous lanolin but carbon tet is no longer available in NZ.
My local chemist ('drugstore' in US) sold me a small bottle of
strict examination and sure information from the RCA manual revealed that my
intentions were entirely legal.
This mixture works very well - one of these big roller inductors (edge-wound)
daily use in a "C-L-C" antenna tuner and has not needed any maintenance during
three years of serious CW contesting - not bad for 1942 manufacture.
I salvaged several roller inductors and big Hammond variable capacitors from
AT3 - all were covered in dust, gunge and mould. While the XYL was away
her mother, I put them all through the dishwasher - ceramic end-plates came out
pristine white and the metal looked brand-new.
73, Ken ZL1AIH (one of the ZM1A Team)
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