"The phone is a remarkably complex, simple device, and very rarely ever needs repairs, once you fix them." - Dan/Panther
Started by Fennec, June 14, 2017, 09:54:19 AM
Quote from: unbeldi on June 14, 2017, 08:05:18 PMI doubt it. The 313A was the first gas-filled tube and those were still pretty big. Perhaps the 426A would be a good fit, but that didn't exist until much later.BTW, the earliest data sheet I have for the 313A is dated Sept. 1936: BSP AB46.595 Issue 1.The conversion from relay to tube ringing is described in BLR 3612 v15(4) p111 Stacy LJ--Vacuum Tube Improves Selective Ringing. So this probably didn't take place until that year.
Quote from: Alex G. Bell on June 15, 2017, 05:57:51 PM> I'll see if I can locate the "minty" (but not pastel green) 634A subset.It's just as beautiful an example as I remembered! The only trouble is that it's a 534A.
Quote from: Alex G. Bell on June 15, 2017, 06:09:34 PMIt must have been a conscious choice ...
Quote from: unbeldi on June 15, 2017, 06:13:50 PMThanks for checking.That probably also explains that it still has a decal as you reported. Although the 1935 catalog still has pictures with decals on the boxes, I don't think that they used them actually. I think by the late 1920s, the boxes had the company name punched into the metal.Re: CA vs AT, the card catalog has no definitive 'replacement', but recommends the substitutions mentioned.
Quote from: unbeldi on June 15, 2017, 06:17:01 PMYes, someone must have been conscious still a year after the crash.
Quote from: unbeldi on June 19, 2017, 06:39:11 PMJust when one thinks to have resolved something, something new pops up: 684AT.The set is certainly not originally a factory product. I believe it was assembled and stamp-marked as 684AT in 1955 when that induction coil was installed, probably with a 426 tube, which would certainly be small enough for the space available. The marking appears stamped on top of a coat of paint likely covering the old marking.Clearly the tube has been removed by now.