"The phone is a remarkably complex, simple device, and very rarely ever needs repairs, once you fix them." - Dan/Panther
Started by Alex G. Bell, July 19, 2017, 12:08:37 AM
Quote from: Alex G. Bell on July 19, 2017, 12:08:37 AMI have a WE H3AD 3 conductor straight rubber-jacketed cord for an F1 handset.
Quote from: Alex G. Bell on July 19, 2017, 12:08:37 AMISTR some early version which had the IND rotated 180º so the winding faced the ringer.
Quote from: poplar1 on July 19, 2017, 08:54:30 AMNeoprene superseded rubber jackets by 1949. New black 302s still had fabric jacketed cords until 1951 or 1952.The coils were reversed starting in 9-38. Note that the writing is upside down on all 302s made from 9-38 - 1954.
Quote from: AL_as_needed on July 19, 2017, 06:40:35 AMI have had some luck with a hot water soak (leaving the contact ends dry of course), or soaking in a small cup of windex. Not 100% sure, but the ammonia in windex helps the paint loosen and lift off.Although this was on a 60's 500 line cord, so the difference in rubber could yield different results. Most modern latex paints are susceptible to water and will soften. Oil based on the other hand can be more difficult.
Quote from: Alex G. Bell on July 19, 2017, 06:13:12 PMI submerged it in straight ammonia for an hour or two. That loosened the paint to the point where it came off with little effort by scrubbing with a plastic pot scrubbing pad with no mineral abrasive. The scrubber rinsed out kind of gray so some small amount of rubber must have come off, but very little.
Quote from: TelePlay on July 19, 2017, 07:10:25 PMThat light gray could just be dirt on the cord and not the cord material itself. Ammonia is a great basic cleaning agent. Most soaps and cleaners are alkali based. Of course, soaps aren't as basic as (NH4OH) ammonium hydroxide so the ammonia would work faster. It's a great greaser so some of the gray may have been oils caught in the pores of the cord surface. Being an aqueous solution, I doubt it dissolved the cord.
Quote from: Alex G. Bell on July 19, 2017, 07:16:31 PMI agree generally, though dirt seems unlikely since the paint would not adhere well to a dirty cord and the ivory paint looked pretty clean. Yes, ammonia is great stuff, I use it for a lot of things, keep a gallon jug of straight ammonia around and I certainly agree it was a much safer choice than a petrochemical or other hydrocarbon based solvent. Given the black stain naphtha solvent left on the rag I saw no point in trying acetone. What rinsed out of the abrasive pad was nothing like that. May have just been a thin top layer of oxidized rubber removed purely by the abrasion rather than by chemical action.
Quote from: unbeldi on July 19, 2017, 07:31:08 PMThe black residue coming off the cord is very common and not alarming. I usually use Fantastic kitchen cleaner, same result.When the cord has dried again from washing, application of KIWI shoe polish (paste, not liquid) restores a nice shine to the cord. Polish it off with a wool cloth, I usually use an old sock over the hand, it protects the hand from the paste and dye, and makes it easy to pull the cord through for polishing action.Finally, spray the cord with a fine mist (!) of water and repolish with the same cloth. This seems to enhance the final gloss. I have some cords that look almost new after this procedure.
Quote from: Victor Laszlo on July 22, 2017, 05:01:24 PMAlex, have you tried using "Goof-Off"? It's pretty potent stuff, but might work.