RCA T-100 info

[Steve K]

If you want a photocopy of the Riders info PM me your address.

Steve

[Phil Nelson]

Done. Thanks!

Phil

[marty59]

Looks not to be in really bad shape at all. My similar model, yes with the KCS28 chassis is awaiting my attention sitting in storage. Yea, a few other projects to wrap up before getting on that one and low priority at the moment.

I'd like to be able to find something that matches for that grillcloth.

Are you going to at least check the CRT?

[Phil Nelson]

I could test the CRT if I knew what type it is. No obvious markings, and I have no schematic.

Phil

[Steve K]

It's a 10BP4. The service info is in the mail.

[Phil Nelson]

There is hope. The CRT looked flatlined on the tester but started to creep back after I cooked it with slightly increased filament voltage for a while. This may be my chance to try rejuvenation.

(And now I need to resume my real project as promised!)

Phil

[Phil Nelson]

This guy is a troublemaker but we're starting to make friends. Lots left to do! Thanks for the manual, Steve.

Phil

[Phil Nelson]

Probably more than you ever wanted to know about this particular set. Anyway, here you have it.

http://antiqueradio.org/RCAT-100Television.htm

I don't see a good match for the grille cloth at my usual sources (AES or grillecloth.com). Any other ideas? It's not strongly patterned, but has little sparkly sprinkles.

Phil Nelson

[bandersen]

Bravo
That's an excellent write up of your restoration project and will be a great help for my 8T241.

I see we're using the same technique of restuffing - dremel, stuff, j.b. weld

I've been searching for 'sparkly' golden grille cloth for several months with no luck Some decent NOS/used stuff shows up on eBay now and then, but none so far with sparkles or metallic threads.

Bob

[jeyurkon]

How about the spray glitter that women use in their hair? I seem to remember reading about someone doing that.

John

[jr_tech]

Great write-up

That is funny about the color, but P-4 phosphor is actually a mix of a "yellow" phosphor which peaks at about 550 nanometers and a "blue" phosphor which peaks at about 450 nanometers... it appears that the blue "ages" faster than the yellow under years of electron bombardment.
Cool observation!

jr

[Phil Nelson]

The mix of phosphors sounds plausible. You would never notice something like this if you kept the same CRT in one TV for years, or put it in another TV with the same orientation. I know this CRT had a different orientation in its first TV because I had put a little lick of tape on the edge to show me where the top was.

Re cloth, years ago I made a sparkly replacement cloth for a Truetone radio by finding light cloth with the right texture, dying it with tea, and spraying it with glitter from a craft store. I followed that with a very light coat of satin acrylic to help the glitter stay on. It wasn't exactly like the original, but close enough that only another Truetone owner would have raised an eyebrow.

This cloth is huge by comparison. The glitter is actually sparkly threads that wander through the fabric in a vague wavy pattern. Maybe somewhere there is a costume fabric that looks close . . . .

Phil

[Dennman6]

[QUOTE=jr_tech;2956684]Great write-up

That is funny about the color, but P-4 phosphor is actually a mix of a "yellow" phosphor which peaks at about 550 nanometers and a "blue" phosphor which peaks at about 450 nanometers... it appears that the blue "ages" faster than the yellow under years of electron bombardment....

I was going to ask about that. I've seen some screenshots of vintage sets here on the site & it seemed to me that many had a "sepia" coloration on the CRT. Didn't know if that was really the case(most late '50s & up B&W sets look "blue-ish" to me in screen captures). I thought maybe it was a setting on the digital camera used for the shot, but was never sure. Actually, I think the "sepia" effect looks better than the "blue-ish" one usually seen. Just curious about that, never gave a thought about the original phosphor colors of early CRTs,

[jr_tech]

The other thing that can happen is that the glass can "brown" due to soft X-rays from the beam. Picture 1 shows a 16AP4 (which was operated at about 15 kV) with a brown area where the tube has been scanned. I had to enhance the colors on the photo to get this very slight "browning" to show up. If I can dig out my 3NP4 projection tube (25-30kV), I will post it later.

[Phil Nelson]

Well, the browning on the 16AP4 looks real, all right. This TV makes only about 9KV, so presumbly X-rays would be less of a factor, but who knows.

Re colors in screen shots, I've found it practically impossible to take a photo that truly represents the picture. Different cameras make all kinds of color corrections (or "mistakes"), the most common being that a B/W screen will look too blue.

I haven't noticed this kind of effect before. Perhaps it isn't common at all.

When my old TVs are working right, the screens look black and white to my eyes, not brownish or bluish. If you look at the screen shots of Wallace & Gromit near the end of the article that I referenced, that is what this CRT looks like now. Those shots were taken in a dimly lit room, with the camera zoomed in so that it didn't "see" the room background and make color corrections for that.

Phil Nelson