01-29-2014, 11:24 PM
Wow, that was quick. Thank you all very much.
Regarding the chassis ground symbol: I see that too, but what I was wondering about was the symbol on the other side of the pilot lamps. I did eventually figure that out by studying the tube schematics: it refers to a common power bus, apparently to drive the tube heaters, in the form of a red wire that's daisy-chained to all the tube sockets except for the rectifier (at least that's what I'd call it on a newer system). Once I saw this possibility, I went back to my original photos and realized that the original length of the black transformer wires was also about right for the nearest red wire terminal, and that there was partially removed solder on that terminal (I actually began this project in July, but had to set it aside for a while due to a death in the family). So now I've got one of the black (small coil) wires tied to that red wire bus, and the other end tied to the ground lug of the Bakelite housing where I believe it was all along.
As for the Bakelite housing, I like John's idea for a new polarized setup with fuse very much. I've tried to set it up according to the schematic, but I think there's a part gone missing because I'm ending up with an incomplete switch connection that way (one of the switch leads is attached to a terminal that physically mounts on the ground screw but doesn't actually connect to it: there's nothing there but wafer-board). Also, very suspiciously, I've ended up with both that black ground wire and one white lead from the primary coil competing for space on the ground terminal... this can't be right, but with the original switch leads being where they are (I never de-soldered them, and the plug wires are right where John is saying they should be), I don't see the alternative.
OK, I just tried to upload a fresh pic from my 5MP Kodak but I'm getting a message that the file is too big... have to work on finding a way to make smaller ones.
Regarding the chassis ground symbol: I see that too, but what I was wondering about was the symbol on the other side of the pilot lamps. I did eventually figure that out by studying the tube schematics: it refers to a common power bus, apparently to drive the tube heaters, in the form of a red wire that's daisy-chained to all the tube sockets except for the rectifier (at least that's what I'd call it on a newer system). Once I saw this possibility, I went back to my original photos and realized that the original length of the black transformer wires was also about right for the nearest red wire terminal, and that there was partially removed solder on that terminal (I actually began this project in July, but had to set it aside for a while due to a death in the family). So now I've got one of the black (small coil) wires tied to that red wire bus, and the other end tied to the ground lug of the Bakelite housing where I believe it was all along.
As for the Bakelite housing, I like John's idea for a new polarized setup with fuse very much. I've tried to set it up according to the schematic, but I think there's a part gone missing because I'm ending up with an incomplete switch connection that way (one of the switch leads is attached to a terminal that physically mounts on the ground screw but doesn't actually connect to it: there's nothing there but wafer-board). Also, very suspiciously, I've ended up with both that black ground wire and one white lead from the primary coil competing for space on the ground terminal... this can't be right, but with the original switch leads being where they are (I never de-soldered them, and the plug wires are right where John is saying they should be), I don't see the alternative.
OK, I just tried to upload a fresh pic from my 5MP Kodak but I'm getting a message that the file is too big... have to work on finding a way to make smaller ones.
