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#1
05-04-2020, 08:21 AM
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USPS track says that the round 2 of the peaking coils will be here midweek.
But I'm still a bit unsure about what to do about the orig 22k shunt vs new 12k. ( it was the only 120mh I could find ) I have not worked much with these type of things, so I'm not sure what to do. Do I stick the new one ( 120mh on 12k ) and see what happens? Or stick it in series with a 10k resistor to try and match the orig 22?
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために 
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#2
05-04-2020, 11:30 AM
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I messsed up the preceding answer and had to edit it twice!
Please refresh and read the corrected version - sorry!
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#3
05-04-2020, 09:02 PM
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2 coils replaced so far, both on the 1st video amp, but no change on the smearing yet, will do the video output next.
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?
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#4
05-04-2020, 09:39 PM
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Quote:
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#5
05-04-2020, 10:20 PM
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Quote:
https://imgur.com/HM6zCI6 I have the term block in there so I can reconfig it to whatever.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#6
05-04-2020, 10:01 PM
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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.
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#7
05-04-2020, 10:05 PM
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Are all the required tube shields in place?
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#8
05-04-2020, 10:22 PM
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Quote:
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#9
05-05-2020, 09:54 AM
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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
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#10
05-05-2020, 08:37 PM
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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.
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#11
05-06-2020, 11:28 AM
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Quote:
Last edited by Kevin Kuehn; 05-06-2020 at 11:31 AM.
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#12
05-06-2020, 08:03 PM
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  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!
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#13
05-06-2020, 09:26 PM
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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.
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#14
05-06-2020, 09:35 PM
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Quote:
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
__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#15
05-06-2020, 09:32 PM
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Quote:
Something's wrong. There's some annoying whine that is permeating the sound. Edit: Never mind, that's Dr. Smith... John
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