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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