Re: [Boatanchors] SP-600 Restoration
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. ___ Boatanchors mailing list Boatanchors@puck.nether.net https://puck.nether.net/mailman/listinfo/boatanchors ___ Boatanchors mailing list Boatanchors@puck.nether.net https://puck.nether.net/mailman/listinfo/boatanchors
Re: [Boatanchors] SP-600 Restoration
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 ___ Boatanchors mailing list Boatanchors@puck.nether.net https://puck.nether.net/mailman/listinfo/boatanchors
[Boatanchors] SP-600 Restoration
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. ___ Boatanchors mailing list Boatanchors@puck.nether.net https://puck.nether.net/mailman/listinfo/boatanchors
