[Boatanchors] SP-600 Restoration

[Al Parker]

Hi Bob,
	The sticky/jumpy tuning is probably due to some lubricant on the brass 
tuning flywheel and it's small "wheel", and maybe the edge of the dial 
it rides on.  Have him clean those well with alcohol, also lube, very 
sparingly, the bushings for the various shafts in the mechanism, as well 
as the end bearings on the tuning capacitor.  Those brass wheels must be 
scrupulously clean to avoid slipping.
	Has this rcvr ever been re-capped?  What is the ser. no.?  If not, and 
s/n is below about 17,500 it will be full (more than 50) of BBOD's, and 
that could be part of the sensitivity problem.
	Is this rcvr new to him?  Does he know its' history, at least for the 
last few yrs, and what work has been done to it?  He can get some more 
hints, etc., from the "SP-600" page on <www.boatanchors.org> - link 
found near the top of the home page.
73,

Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 7/16/2014 10:22 PM, Bob Jackson wrote:
> I have a friend (Seriously, not myself!) with a J21 model (I think) that he may wish to have 'made right'. It is in 'working order' but with low sensitivity and sticky, i.e. not smooth, tuning. RF alignment, I'm told, is spot on. If swapping a few tubes and some general dusting off/out doesn't help, he'll be looking for someone who's ready, willing and able, etc. to make it 'right'. In this case, 'right' means fully functional in the manner and means it was intended to operate with but without cosmetic refurbishment. I will happily pass along any/all suggestions made to me (off list, please) for him to follow up on.
>
> Thanks and 73 to all,
>
> Bob  AG5X
>
> PS Yes, he understands that shipping a '600 is a severe task in every respect.
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