a real challange?

[old_tv_nut]

Originally Posted by Yamamaya42

...

But what are the chances this may be caused by the Test CRT?
I mean it being JUST different enough to cause slight problems like this?
...

Too many posts to go back and find out what your current setup is - are you connected by long wires to the test CRT? This could cause some loss of high frequencies.

[old_tv_nut]

Are you talking about the smears in the video you linked in post #322 (Lost in Space)?

That kind of long smear is not likely from peaking coils. In fact, it doesn't seem to occur uniformly on all parts of the picture, but looks more like a regeneration/oscillation problem. You may want to take an insulated screwdriver and touch various tube pins in the video, IF, and tuner, to see if there's a spot that's sensitive to some extra stray capacitance. Touch the CRT cathode and grid too, to see if they are radiating back into the set.

[old_tv_nut]

Are all the required tube shields in place?

[Yamamaya42]

Originally Posted by old_tv_nut

Too many posts to go back and find out what your current setup is - are you connected by long wires to the test CRT? This could cause some loss of high frequencies.

they are no longer than about 10-10.5 inches, I did extend the rather short wires on the CRT socket when I re-wired it, but no longer than in most color sets, prob shorter,
https://imgur.com/HM6zCI6
I have the term block in there so I can reconfig it to whatever.

[Yamamaya42]

Originally Posted by old_tv_nut

Are all the required tube shields in place?

yeah, all shields are in place.

[Yamamaya42]

So I guess the next step with this thing is...
Go through the whole video amp circuit, video detector → video output, and make sure there are no more old resistors left.
This will not make any difference, most likely as 75% have been changed already and the old checked in circuit, but this way I can definitely say it's NOT resistors, will also put in the new coils at the video output stage, ( got them, might as well use them ), will also do a 3rd check of the replaced caps in the area. :/ mostly .05 paper caps (coupling) replaced with film type .047.

When done, I will attempt to use the 12lp4 for the first time, which will be a bit tricky cause I got to work out how to support it safely.

I will most likely try the newer trap, as the old one seems very weak.
There are very detailed instructions about how to put on the ion trap in the RCA 630ts service guide, mentioning “ion trap flags” in the CRT, and lining them up, but it was written for the EM version, not that different but, I am to assume the the arrow stamped in permanent magnet trap is to point to the screen?
https://imgur.com/byyV6dg

[Yamamaya42]

been over the video amp section again, and after putting in 2 new coils, found nothing else wrong, other than a 47k res at 55k, replaced, but not the cause.

I do see the same smearing of video no mater if it is input via the tuner or direct input, also, I saw no visual difference in picture when i pulled out the 6AL5 being used as "dc restoration" while watching with video input, and I did swap it with the other 6AL5 from the audio sec, no change.

I'm tending more now to think that this may be due to the diff between the test CRT and the original types.
I wont be able to test this for sure till this weekend or so.

[Kevin Kuehn]

Originally Posted by Yamamaya42

they are no longer than about 10-10.5 inches, I did extend the rather short wires on the CRT socket when I re-wired it, but no longer than in most color sets, prob shorter,
https://imgur.com/HM6zCI6
I have the term block in there so I can reconfig it to whatever.

Your extra long CRT wires and the terminal strip aren't an ideal situation. A lot of manufactures intentionally separated the video wire from the others to eliminate stray capacitance. Personally I would get rid of the terminal strip and shorten those wires. Not a guarantee it will fix all smearing, but what you have there is poor practice considering the frequency response of the video signal.

[Yamamaya42]

WOW!

My guess was right.
I have been chasing ghosts , literately

https://www.youtube.com/watch?v=xJhhr12FFrI

Here it is on the 12lp4.

Not fully adjusted yet, as i don't have a permanent thing to put it in yet, but DAMN!

[Kevin Kuehn]

Hmm..I wonder if maybe you got a flaky test CRT. Can't say I've ever used an 8YP4. I'll assume you knew that you don't use an ion trap with a test CRT. I have no idea what that could do if you did.

[JohnCT]

Originally Posted by Yamamaya42

WOW!

My guess was right.
I have been chasing ghosts , literately

https://www.youtube.com/watch?v=xJhhr12FFrI

Here it is on the 12lp4.

Not fully adjusted yet, as i don't have a permanent thing to put it in yet, but DAMN!

Something's wrong. There's some annoying whine that is permeating the sound.

Edit: Never mind, that's Dr. Smith...

John

[Yamamaya42]

Originally Posted by Kevin Kuehn

Hmm..I wonder if maybe you got a flaky test CRT. Can't say I've ever used an 8YP4. I'll assume you knew that you don't use an ion trap with a test CRT. I have no idea what that could do if you did.

i chose the 8YP4 cause it did not need any focus or Ion trap, I did not want to mess with it when I was restoring things.

today was the first time ever setting up an Ion trap
and the 8YP4 was used. :O

[Yamamaya42]

Originally Posted by JohnCT

Something's wrong. There's some annoying whine that is permeating the sound.

Edit: Never mind, that's Dr. Smith...

John

that is the fans in my server..
2 of these

https://www.youtube.com/watch?v=on9pvkJ0P1w

[Kevin Kuehn]

Also you don't use a focus coil with a test CRT. I'm probably stating the obvious but there's no telling what can be overlooked. Never mind, just read you post before mine. Good on you.

[Yamamaya42]

Originally Posted by Kevin Kuehn

Also you don't use a focus coil with a test CRT. I'm probably stating the obvious but there's no telling what can be overlooked.

correct,

that is why I picked it,, of the few that ETF had, it was the only one that I did not have to worry about ion trap and any focus ( automatic ), i just happened to pick the VERY used one, it had scratches and 2 burned spots on the screen.
they still have 1 new on I think.