My "new" 1954 CTC2B 21CT55 21" roundie

[etype2]

Looking very good indeed.

[Hagstar]

Originally Posted by walterbeers

Cathode current of the 6CB5 I think is a little high, 223 ma or so, and I tried adjusting the horizontal efficiency (linearity) coil and that is the minimum current I can get it adjusted to. Picture even looks a little better with the tubes in there. High voltage is running around 22 to 23KV, but it will not adjust up to 25KV as per the Sams. .

NICE ,

I want one of these for a next project sometime in the next few years, more than a CT100. And the figures and results you give above interestingly are the same as my CTC4.

John H.

[Titan1a]

Righteous!

[ChrisW6ATV]

Your 21-CT-55 looks fantastic, Walter. Very nice work.

[bozey45]

My CTC11 is in the same blonde cabinet as your 9 I believe, very similar anyway.

[joemama99]

Holy cow,Walter! Nice job...

[Kevin Kuehn]

It turned out great!

[walterbeers]

Originally Posted by walterbeers

Well, I have it done, at least for now. I'm sure maybe with more time I can improve upon it some more, but it does have good color, and is completely back together and working. Not bad for a color set produced at the end of 1954. I thought I would post some final pictures of this RCA CTC2B, 21CT55. Also in case someone is wondering about the set next to it in the one picture, it's my CTC9. They are 2 of my most prized possessions. Yes, lots of work has gone into it, but didn't really cost me a lot of money. Just the usual stuff, capacitors, some tubes, the color crystal, a doorknob capacitor, a few resistors, etc.

Well, the set is still operating, with good color. I turn it on every now and then just to make sure. Takes little time for the color to stabilize, (possibly a slow warming tube), but once on for a couple of minutes it looks great. My CTC9 still works as well, but needs a little more TLC. My helper (LaLa, my cat in the fourth picture) helps me relieve a lot my frustrations when things don't always go the way I think they should. Also a lot of thanks for my friend Rick (titan1A) for giving me the encouragement to keep at it and not become discouraged. Also many thanks to Jamie (jstout) for helping me get this set. Also thanks for all the advice and posts from the different members of VK.

[MRX37]

How is its color reproduction compared to your CTC 9?

[Steve D.]

Outstanding restoration Walter. You should take great pride in your work.

-Steve D.

[walterbeers]

The comparison of the CTC2B (21CT55) and my CTC9. MRX37s post above got me interested in which was better. Obviously the CRT in the CTC2B is better than the CTC9 but in person, when not comparing the 2 together they both seem to have pretty good color balance. I paused the title page of a DVD so I had the same image on both sets and I must say as of right now, the old 1954 21CT55 wins, (at least in my estimation). Here are some photos. (After looking at the pictures, I see I didn't have the tint (hue) controls set exactly the same.)

[MRX37]

Thanks for doing that. I asked because I've gathered that the CT-100 and the 21CT55 have better color reproduction then everything that came later, so I asked because you own a now working 21CT55 and a later CTC set.

Would love to see it compared to, oh say a Trinitron or some other more modern high end CRT set.

[etype2]

Originally Posted by MRX37

Thanks for doing that. I asked because I've gathered that the CT-100 and the 21CT55 have better color reproduction then everything that came later, so I asked because you own a now working 21CT55 and a later CTC set.

Would love to see it compared to, oh say a Trinitron or some other more modern high end CRT set.

I could not resist the invitation although I don't think it's a fair comparison. A screenshot from a Sony KD-34XBR960.

The attached thumbnail looks compressed and blured so this link is not compressed of the same image.

http://www.visions4.net/journal/wp-c...ce-2560-WP.jpg

[dtvmcdonald]

I've not compared my CT-100 with a Trinitron CRT, but have
compared it with a medium end Sony 55 inch LCE set and a very top end,
Adobe-RGB gamut capable monitor, on the same set of still images
all made with a high end camera set to Adobe RGB wide gamut.

The CT-100 is not perfect, but has always been very close. I have posted comparison
images in my CT-100 thread. Recently I have even gotten my CT-100 gray
scale better, and they are not even closer. Except in scenes
with very bright, very pure yellows or mid-scale magentas they
are identical.

At low saturations they are almost perfectly the same. As one
increases saturation, magentas on the CT-100 start turning violet
at normal contrast. At low contrast this does not happen.

On those picture you posted, look at the upper left where a spire shaped magenta
building appears: on the other set there is no color discriminatiopn for it.

P.S.: my avatar does appear essentially identical on the CT100 and the monitor,
color wise.

[Steve D.]

Walter,

In comparing the 2 set's images, I'm seeing more screen information on the 21CT55 then on the CTC-9. Interesting because the masking on the CTC-9 and it's 21CY tube offered 260 sq. inches of picture. The 21CT55 w/the 21AX. 254 sq. inches.

-Steve D.