With the type cataract you have, i'm betting the crt was made by RCA. Most Zenith and Sylvania crt's would have a green halo instead of the mildew looking catarac's like RCA's are known to have.
-Tony

Did you happen to notice that picture #7 a few posts back in this list shows the tag attached to the original CRT? It does have a code on it which I believe is 1 445. I don't know if this is the E.I.A. code? And if it is the code, I don't know how to interpret it?

If this isn't the correct code....I'll have another look at the tube for it.

Tony...I tend to agree with you....the cataracts look very much like the kind found in the RCA CRT's.

Bob.

RCA would be "EIA 274".

I looked at several things I have around and they don't use the word "code", just "EIA 343" for Zenith. (but their CRT's were EIA 1101 for the (Rauland division), Zenith company.
CRT's, tubes, modules and some other parts usually had the EIA code on them.
In the 60's it seemed like a lot of parts were shared. Some receiving tubes in Zenith would have "Zenith" printed on them but the EIA 274 would tell you it was a RCA tube. I think it got to the point that there was no reason for 3 or 4 companies to build the same receiving tube, so one company would build all of 1 type and they would share. With the EIA code you could always tell who was responsible if a problem developed. One of my Zeniths has an original CRT that although labeled "Zenith" was built by Sylvania. I even saw a few new sets come with a crt built by Channel Master.

Just curious what went in the DuMont.

Here is a partial list of EIA codes someone posted.
Tubes and CRT's EIA code
Amperex (USA) 111
Bendix 125
DuMont 158
Eimac (Eitel-McCullough, Inc) 162
Electronic Tube Corp 169
General Electric Co (USA) 188
Hytron (CBS-Hytron) 210
Machlett 231
RCA (Radio Corp of America) 274
Raytheon 280
Superior Tube Co 310
Sylvania (Hygrade Sylvania Corp) 312
Tung-Sol 322
United Electronics 323
Western Electric 336
Westinghouse 337
Zenith Radio Corp (CRT's) 343 (Rauland division 1101)
Nortn American Philips Corp 423
Taylor (aka Cetron-Taylor) 713
Lewis & Kaufman 738
National Electronics (also Cetron) 749
Penta Laboratories 771
Vacuum Tube Products 781
Varian Associates 809
Litton Industries 879
Electrons, Inc 935

Sams would include a complete list of EIA codes periodically. Very handy to have. I don't think I've seen a full one online, which seems strange.

That is almost certainly an RCA tube. They were close to being the only volume producer of color crt's at that time. Later DuMont sets did use Sylvania sourced picture tubes.

Here is a pretty good list of EIA codes:

http://www.triodeel.com/eiacode.htm

And the Winner is.....................Drum Roll......................................

EIA CODE 312 Sylvania (Hygrade Sylvania Corp).

Attached is a picture of the code number. I didn't see it the first time around as it was sitting almost directly under the tension spring across the bell of the crt.

Thanks for all of that information. I've learned something about EIA codes.

Bob.

If anyone going to the ETF convention is interested in a DuMont roundie, I'll have one in the auction:

http://myvintagetv.com/sell/dumont_brookville.jpg


Chuck

I'm plenty interested!

A handsome set-I'm sure it will sell. Is that CTC 10 or 11?

To me! MUAHahahahahhahaMUAHhahahahahh!!!........unless the price goes too high.:)
BTW, is that the chassis for it sitting on the floor?

I think so...that's what they look like. Sits upright right behind the control panel.

Yes, that's the chassis beside the cabinet. I'm picking up the set tomorrow and I'll try to post a better picture when I get it home.

Chuck