Question on CRT numbers

[oldtvman]

Do anyone know what some of the roundie numbers were converted to in later production models for example the Zenith on ebay shows the current crt number as 19vabp22lt I know Rca did some of the same with the Hi-lite line of tubes.

The reason for the question is there is a distributor near me with a lot of old crt's and he shows having a 19vabp22lt in stock, but when I called them he said the box wasn't as big as what you would expect for the 70 degree tubes

[jstout66]

It's gotta be a roundie. Altho I can't remember all the later numbers they used, I looked on a B&K tube tester chart and the same socket is used on a 21FJP22 and the 19VABP22.

[Eric H]

This is the one you're talking about? http://cgi.ebay.com/1960s-Zenith-19-...QQcmdZViewItem

I hadn't even noticed it was listed as a 19" set.
Did Zenith just decide to designate it by viewable area rather than overall size or is this actually a smaller tube than the 21" roundie?

[Jukin Jay]

Originally Posted by Eric H

This is the one you're talking about? http://cgi.ebay.com/1960s-Zenith-19-...QQcmdZViewItem

I hadn't even noticed it was listed as a 19" set.
Did Zenith just decide to designate it by viewable area rather than overall size or is this actually a smaller tube than the 21" roundie?

That may be exactly what happened. Before an FTC ruling sometime in the 1960s, manufacturers would use the outside diagonal (diameter for a roundie) measurement of the tube envelope to designate size. The ruling forced them to switch to the viewable area. Probably not exactly Zenith's voluntary decision, but something they had to go along with.

[compucat]

The set in that listing has a replacement CRt in it. The sams calls for a 21FJP22. Incidentally, I'm the one bidding on that set. If I get it, it will be my first ever color roundie.

[old_tv_nut]

I believe the "v" in "19v...." actually stands for "viewable"

[Chad Hauris]

The last round sets I have seen were built in 1970 or so, before the "viewable" image size rule came around so I think they were always advertised as 21" sets originally. The 19V type tubes would all be replacements.
It also seemed like advertising by square inches was more common in the 50's and 60's. A 23V" set would be advertised as a 295 sq. in . picture. Am not sure if this was viewable or total tube glass.
Yes, the "V" is viewable thus, 25XP22 is the same size as 23VALP22,
The sets we would call a 25" today were initially introduced with a 26...P22 designation.

Someone recently gave me a JVC set which states on the back : "27" color TV in America; 29" in Canada and South America" or something like that.

[blue_lateral]

I think the phosphors are all the same brightness in those 19v roundies. Might require a slight circuit change in some sets, but a little more brightness is possible, as youre not limited by red. YMMV.

John

[kx250rider]

The military one that I put in my Zenith is a HR21GVP22A, if I recall. I know there were also several 19V versions, including a REALLY nice Magnavox that came out as a replacement in the early 80s. It had a deep black face, unlike any of the other round tubes.

Charles

[kx250rider]

Originally Posted by jstout66

It's gotta be a roundie.

Not necessarily ... The Toshiba, JVC, and Sharp sets had 14" and 19" rectangular tubes with the same big neck as the 21FJP22. Those are really unusual, and I've only seen 4 or 5 of them. I had a Toshiba 14" consolette which AKer Tom Ryan now has. Dr. Dan has a Sears Toshiba 14" wood console too.

So I wonder if that number shown in stock might be a 19" rectangular tube?

Charles

[oldtvman]

Well it may be worth a drive up to Michigan to see the tubes they have left. I'm hoping that one of those converted numbers is actually a roundie in sheep's clothing

[kbmuri]

I really like this set, for obvious reasons listed in my other thread (http://audiokarma.org/forums/showthread.php?t=75451).

I've been stressing a little bit over buying it and leaving it sit in a corner of my den broken. The price, with shipping, sort of says "no". I know my limitations, and I don't think I'm qualified to restore this one myself. I've brought a hundred transistor radios back from the grave over the years, and I have a 95% success rate with old tube AM and/or Shortwave radios. I know all the basics, but there's a level of "field experience" that some of you AKers have that a person needs to work up to. I'm just not there.

oldtvman, if you get it, I'm not far from Mishawaka at all, I hope if you restore it, you'll show it in public at some point. I'd love to see one in person sometime...

[southernguy]

My Silvertone roundie that I got from rcaman has a 19vabp22 (bonded glass) in it. Sams calls for a 21FBP22 or 21FJP22.