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I can't tell, but the tube looks strong in your pic.
IIRC, the correct setup for the drive controls would have at least one at 100%, the other two adjusted for best grey scale at high contrast and brightness.
The bias controls would normally be adjusted about half way give or take.
These were never the brightest TVs, but they were bright enough to produce an accurate, not cartooney over drive pic that people today seem to love. There is a contrast preset pot someone on the board (orange towards the middle??). I used to turn them down a bit so customers didn't crank the crap out of the contrast.
They were never perfectly focused in the corners either, but good enough. These were almost flat CRTs, but IIRC, RCA didn't use a modulated focus in the 140 as they did in later 169s (the higher end versions).
If your grey scale is accurate and you can focus it sharply, the tube is probably fine.
As for the E variant, RCA just added letters to differentiate the difference between all the models that used the same basic platform.
Your E has a computer that no other RCA 140 had, and that is the Dimensia processor. IIRC, it's on it's own daughter board. Notice the RCA connector that says "control"? Other 140s didn't have it. That's unique to the E and the Dimensia series.
Other variants would offer fewer AV jacks, different audio output ICs and associated components, or if it was a 20", would have a different flyback and other 20" specific components that only that variant would use, so the tech would use the schematic for the exact chassis.
The later 169 variants were even more varied. Some had pix in pix, no pix in pix, or 12 picture pix in pix, one of several analogue and digital comb filters, one of five or six different audio sections, different deflection circuits depending on CRT etc.
John
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