"The phone is a remarkably complex, simple device, and very rarely ever needs repairs, once you fix them." - Dan/Panther
Started by unbeldi, March 26, 2017, 11:29:47 AM
Quote from: KaiserFrazer67 on March 26, 2017, 08:00:40 AMCenter AE 90: NB 92219 CXX- Date code: 10-66-16
Quote from: AE_Collector on March 26, 2017, 01:02:45 PMIt seems surprising to me that the letters stamped on the large side of the condenser usually (always?) appear to be stamped during the manufacture of the condenser. Likely the same for other components as well such as the capsules. Thus they aren't being stamped on during assembly which admittedly would be a bunch of fooling around with ink slowing everything down. Therefore, it seems more likely that parts with two letter codes were stamped sometime before assembly.
Quote from: AE_Collector on March 26, 2017, 07:49:44 PMThanks Tom! We are all still learning this stuff here too. I just learned that there can be "two letter" codes on the network PCB. I hadn't noticed that before but then for some reason I hadn't looked very closely even though I have seen them on some of the potted networks. Certainly looks like OH EYE to me and I should be 1966 the way we are leaning at the moment. We haven't really got a handle on the first letter "O"...whether they started with A at the beginning of January (or not....could have been a year that ended say March 31 too) and if it did start at the beginning of January did it increment every other week using up exactly 26 letters in 52 weeks? If so, "O" would be in August where as the phone is dated October. But, if these were pre coded as they were made and tested(?) then a month or two wouldn't seem unreasonable to have the parts in stock in boxes waiting to be put into phones, in this case a phone that wound up with 10-66 on the base.Who was your telco back in the 60's? If independent using AE phones, quite possibly a Step by Step office then eventually converted to electronic. I think someone, probably Unbeldi reported what your office switch is now. It may have been GTD5 in which case very likely an AE operating company. Straight Line ringers are more tolerant of different frequency but your 30 cycle ringer must be seeing 30 cycle ringing or something very close to that. It seems surprising that it has a nice strong ring but not as surprising as if it were a higher frequency ringer than 30 cycle. I'm in a GTD5 office so I would try a 30 cycle ringer on for size BUT, I'm in a remote which isn't AE. Likely a SLC2000 so me testing would indicate nothing about your scenario though you could be on a remote as well.Thanks again for the additional info!Terry
Quote from: KaiserFrazer67 on March 26, 2017, 11:19:28 PMI probably should tell you that I did have to tune the 30~ ringers a bit, as they vibrated, but didn't ring when I hooked them back up around a month ago after about 20 years of not being used. (This was after I got the dials refurbished.) Not really understanding what was going on--to me, a ringer was a ringer; I knew nothing of frequency vs. straight-line ringers, and I had just put the failure of the ringers down to the coils aging from the phones being in storage all this time. It was a simple matter of moving the gong positions and adjusting the position of the plate relative to the coils, which got them ringing nice and loud again.
QuoteThat also explains why I couldn't get the 40~ ringer tuned on the AE40 I just got from Marie. Again, it would vibrate a bit, but not ring. The only way it would ring is if I took all the tension off the spring plate and adjuster wheel and left the nut loose so there was nothing holding the spring plate in place.
Quote from: mentalstampede on March 27, 2017, 11:23:41 AMDepending on what frequency you have, a capacitor change may also be required to get a frequency ringer to respond to 20~. I had a 50 cycle ringer I was playing with and my electrical engineer of a brother informed me that the value of the capacitor was acting as a low frequency AC filter and preventing anything less than 40~ or so from even getting to the coils.