Silvertone 7140

[dieseljeep]

Originally Posted by miniman82

To add to the mystery, this tube has no neck weld which would tend to indicate it was rebuilt. But the base did have a 274 EIA code on it which is RCA.

Every early color set that I've seen, that used a 21AX CRT, that CRT had a EIA 274 on it. That was a GE, Hoffman, Motorola and an Admiral. It had the OEM brand name on it, with a 274 EIA.
IIRC, Sylvania was the main supplier to Sears for their replacement tubes. The OEM tubes were made by several different Mfg's.

[miniman82]

Chassis is now moved to the designated resto bench in the garage, where recapping can take place. I've already stuffed the can 'lytics and replaced a few wax tubulars, but there are many more discrete 'lytics and other assorted caps that need to be rooted out before I fire it up again. I also need to figure out how exactly to connect the horizontal deflection coils to the test jig: the chassis has a center tapped setup where the center tap is cap coupled back to the flyback, while the test jig doesn't have a center tap at all. I can probably do one of two things, either leave the CT out or add one to the jig's yoke and see what happens. If I can't get it going, I'll just have to wait till cap replacement is done then put the CRT back in.

Eric: the replacement base worked flawlessly, thank you very much. I was even able to use a brass wire wheel to remove the 21FJP22 mark on it, it disappeared leaving shiny black plastic behind and you can't even tell it was ever replaced.

Here's where I'm currently at: