Have you tried just cleaning them? even though they are probably supposed to be "sealed", most of them are not. if you purchase a can of pressurized tuner cleaner, radio shack used to carry it. saturate the volume control while turning it. i usually wrap the unit with paper towels as to not get the rest of the board. i also usually put on my safety glasses. you will see why. i am usually surprised as this works well with 90 percent of them i do.
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Although the pot is broken it may just be the wiper part & you can try measuring across the outside terminals (if broken disassemble)with an ohmmeter (DMM). If you get a reading say 10k ohms then you know what to order.
The page below describes mods to the Superadio III plus a bit about spare parts when you scroll to the end........
GE and RCA SR-3 production suffers from an ill-advised change in tuning potentiometer. It causes the tuning to be unstable - the radio is almost unusable due to difficulty in tuning to stations and the radio has difficulty staying on stations.
The value of the pot is a bit unusual - 300k. I have found that a 500k pot, with 470 fixed resistors across each leg (low to middle, middle to high) allows the radio to tune the entire AM and FM bands, although dial calibration is really bad. The tuning voltage high and low pots will need to be adjusted at the very least, and the whole front end will probably need re-alignment.
I have modified at least a half a dozen of these radios this way, Fry's has an appropriate pot but the shaft is aluminum and needs to be machined. The radios are as stable as early production SR-3's, and are fine DX units.
The FM section can also benefit greatly from the narrow ceramic filter modification. I can routinely use the radio for stations over 100 miles away after the modification.
If you have one of the older original pignose 7-100 amps the volume pot will be a 10k audio pot. If it's a later model it will be a 50k audio pot and your local Radio Shack should have one and if not they can get one. Or go online to Mouser Electronics, All Electronics or any one you prefer and order it online and it will show up right in your mailbox. Let me know if your pignose is an older original model. If so then you may be able to do me a favor regarding the same model, thanks, Bob carter....firstname.lastname@example.org
the volume control needs to be cleaned. if you can carefully take the back off, the volume control may have some small openings in the housing. spray contact cleaner (or even a small amount of wd40) in it and work the control back and forth and see if that does it
sorry to say no , if you try to peal it off or scrape ot off you will crack the cooktop . this keeps happening i have seen it at around 4 times for some reason revere ware melts . there should be a warning in the manual ( i know ge does have the warning about copper bottoms ) . replaceing the cooktop or the whole stove is the only "true" answer .... sorry .....Please if this answer helped , please rate this 3 or 4 stars . and keep me in the paid answer department . A 1 or 2 may knock me down into the unpaid ranks. Thanks Cactus Bob
try to clean the vol. control with some elctronics parts cleaner, it comes in an aresol and you spray it into the pot, the crackling is dust or dirt in the potentiometer<pot> this is a common problem on older machines that havent been used in a while or live in a dirty enviorment.