Question about the Pair of CT-100's at ETM Auction

[WISCOJIM]

Originally Posted by Electronic M

Good news and more towards the original topic. The green gun was FAR from dead, but WAS deep asleep and tested very weak initially. The green gun has woken up to be the strongest so far centered in the good range. Red is close to green. Blue is at the lower end of good. Edit: Blue woke up more.

This is shaping up to be a good 15GP22 CRT!

Such luck!

Go buy Powerball tickets...

.

[Phil Nelson]

What a great score. I'm sure you'll do a thorough & careful job of restoring that CT-100.

I'm curious about that DuMont monitor, too. Perhaps you can post some photos & details when you get around to that project.

Have fun!

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html

[dtvmcdonald]

What we all want to see, or at least I want to see, before I start crying
in my coffee for not bidding, is a raster only, two guns cut off, that has
good purity. I have a theory that might make it possible.

[Electronic M]

Originally Posted by dtvmcdonald

What we all want to see, or at least I want to see, before I start crying
in my coffee for not bidding, is a raster only, two guns cut off, that has
good purity. I have a theory that might make it possible.

Ask and ye shall eventually sort of receive...Video is still wacky which makes getting a bright plain raster tricky, and getting a pattern to attempt static convergence a downright pain in the but. It would seem the initial recap left several of those lousy chalk peaking coils, and sloppily j-hooked in many of the new caps...I'm glad it is pre-recapped, but some of the workmanship, to put it kindly, is not how I would have done it. Soon I hope to bench it and go over the video circuits. Purity and convergence pics shown below represent my first attempt on a 15GP22 based set. It is a completely different process from every CRT type that followed. Most of the time I felt like I had been dropped in Brittan and asked to drive one of their backward cars on one of their backward roads. Static convergence was off by a mile when I did the purity so if it is anything like a later set then that will affect the purity, and I'm probably going to have to go back and forth between static convergence and purity a few times before it is right (only did purity once followed by one round of convergence). Static convergence is REALLY weird on this set there is the side knob (which gave me a choice of how wrong I wanted it at first) then the static magnets are similar but different from later CRTs...Specifically, there is only blue lateral action from the magnet and the DC convergence knob on the HV cage needs to be used in conjunction (and it affects all three guns)...In summary purity and convergence are sort of decent, but not perfect.



I'll probably be able to improve it more in the future.

For now, I plan to focus on the video circuits...The lumina channel will pass very weak video with the chroma off, but not nearly as much as it should, with chroma up it will get VERY bright but it seems like the color demod is not working correctly...Looking at the clock I should probably sleep and worry about it tomorrow.

[fixmeplease]

Your deal sounds even sweeter! Lets hope it stays alive.

[NewVista]

50's Admiral color ($1000) very desirable, rare.
Wonder why blonde ctc-5 went for less than blonde 12" GE B&W?
- Got excited, thought I had one, but it was a blonde Hallicrafters 12" (pic)
Good to see 50's limed oak item prices on the rise!

[Kamakiri]

The blonde 5 had an FJP conversion....I'm still kicking myself in the ass for not going on it

[NewVista]

Originally Posted by Kamakiri

The blonde 5 had an FJP conversion....

That would be a sweet TV.

I'll have to settle for adding the Hallicrafters 12 to my mid-50's blonde room, where 'time-stands-still' (pic)

[old_tv_nut]

Two questions:

Do you invite people to see your Rembrandt?


What is the lighted object on the wall to the left of the clock?

[NewVista]

Originally Posted by old_tv_nut

Two questions:

Do you invite people to see your Rembrandt?


What is the lighted object on the wall to the left of the clock?

Wow, you spotted the Rembrandt!

Object next to clock can be identified here

[Chip Chester]

It's not really beer unless it ends with a "Z".

[NewVista]

Experienced techs would have been skeptical of the description of this auction item as "two good guns + one no emission" doesn't add up as typical failure/aging. So definitely worth gambling on this item.

As far as vacuum goes, this is another miracle survivor of RCA's ridiculous glass-tin-glass picture tube.

Note to RCA: If Lawrence & CBS can make all-glass color tubes, so should you with your unlimited budgets.

[EdKozk2]

Hi Tom,
Great to see all three guns working on your CT-100.
Ed

[old_tv_nut]

Wow, next time I want to shake your hand to see if any of this luck rubs off! Congrats on making past the big "if" of a good tube!

[Electronic M]

Thanks, everyone. Ben thank you for giving me some backstory on it. It seems the HV is around 19KV according to my backup HV meter (I still have not gotten to replacing my main meter since it broke). I built a good video injection amp for the CTC-2 family a few months ago so I plan to ignore the IF system completely until the video and chroma are working properly...Even then I probably will need to learn alignment on something else first. The look I had under the chassis was a 2min low light search for peaking coils and rough sizing up of the work on it. I'm sure the pending full exam is going to be interesting.