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Thanks for the interesting follow on.
Sylvania made a lot of tubes for Philco, CRT and othewise. Regardless of the brand name, if the tube is coded 312, then it was made by Sylvania. If it's coded 260, it is a Philco.
I worked on a lot of those Philco TV123 chassis. Many of them ended up in executive's and dealer's homes and a considerable number in consumer's hands. I had one myself for a few years and eventually sold it to my boss at Philco.
Philco provided a massive modification kit for that set. It called for a sub-chassis to enable 2 5U4s to replace the 5V3, totalling 3 LV rectifiers. It also included an improved flyback and high voltage rectifier circuit, a few resistors and capacitors, horizontal output tube and other parts. It greatly improved reliability.
There was also a cable kit, PN# 425-0004-1, to facilitate service. That included yoke, high voltage, CRT and convergence cable extensions. I still have one of those in the box, but I doubt that it's complete. I also have what's left of a factory test set up. It was a huge wooden roll around rack that housed the CRT and allowed room to work on the chassis. I have since cut it down and use it for a radial arm saw.
That TV will put out a nice picture. It will not overload the chroma saturation like an RCA or GE, but will have enough.
Don
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