[Hammarlund] SP-600 band change scraping noises?

[Philip Atchley]

Hi,

I'm working on a couple SP-600 "RF Decks".  One seems to be quite "smooth" and 
normal when changing bands (I've finished re-capping it).  The other one prior 
to disassembly made some rather rude "scraping noises" when changing bands.  I 
examined all the "fingers" and little coil pegs after I disassembled it.  I 
didn't find anything out of the ordinary (bent/worn fingers, damaged pegs etc) 
and I wonder if a "LITTLE" lubrication of the coil pegs would do any harm 
here.  I have a variety of lubes that I could use.  Probably first choice is a 
"conductive grease" like electricians use for wiring, a high quality light 
weight "black" grease we use on VCR's, Lithium etc.  I would want to use only 
a "non hardening" grease, and just a dab with a "toothpick" on each peg.  I'm 
afraid something like DeOxit would evaporate or run off and not be very 
effective for the long term.

What do the gurus say?  It "sounds" like if I leave it like it is that the 
"Fingers" will wear out prematurely. On the other hand, if even a light grease 
would contribute to instability after the set is reassembled, I would want to 
avoid it altogether.

What's interesting is that the "basket case" (removed from chassis) RF deck 
seems to be in better overall condition than the one that was still in the 
receiver!

73 de Phil,  KO6BB
991 Different NDB's heard to date.
SWL QSL GALLERY: http://photobucket.com/albums/y123/KO6BB/
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