CT-100 alignment is tricky. Beware that the Sams and the RCA manual have one of the waveforms inverted. I can't remember which one, but it was posted on Pete Deksnis's site a while back.

Thanks very much Steve, I did read about that and other errors as well. It sure is great to have access to the experiences of others.

Not much time to work on it today but when cleaning the tuner I found that the K3E mixer diode is essentially a 10 meg resistor. Anyone have a suggestion for a good sub? Hopefully something common.

1N82A should work fine.

I left the alignment alone on my Ct-100,it worked well,i had it hooked up to a HDTV downconverter,set to channel 4,however i did have to tweek the 3.58,but that was fast and easy,the i.f and other chroma alignment seemed too confusing in the manual,and was not real clear..one other thing i did to my CRT was seal the glass to metal seal with a layer of "VACSEAL" and i actually put it on the brass crimp nipple area on the base,this stuff takes almost 30 days to cure and dry,(i think my pic of me doing this is on petes website),but is tacky enough within 2-3 days and the tube can be reinstalled after this period,I had a talk with someone from the company that makes this stuff about 4-5 yrs ago..
I will mail out those coils on my post office day on weds to you..
good luck.!
terry

Thanks Bill and Terry. I have an NTE112 diode on order.

I have already performed the vacseal treatment on the CRT. It Seemed like an important thing to do.

The Tuner is all cleaned up and now I can tune a good picture looking with a scope at the input of the first video amp. Seems like maybe I will not have to touch the IF. I have not swept it yet. Next issue is that the color will not lock. I can get it to stabilize for a bit by turning the AFC balance control but then it will come unlocked again. Tweaking the AFC control again will bring it back to lock. The Hue control does seem to work but, looking at the scope, it looks like the hue is 180 degrees out, when it is locked. The reference oscillator appears to be working fine. I may not have much time this week to troubleshoot but I'll get back to it as time permits.

Once I get the cabinet out and the CRT installed, I'll post some photos. I am trying to get most of the troubleshooting and functional verification done before I put the chassis back in the cabinet.

[QUOTE=Tim]Hope everyone had a great Halloween. After the trick or treaters quit ringing the bell, I grabbed a Peanut Butter Cup and decided it was time to put some volts to the chassis.

Tonight was a meaningful night to do that as it was 50 years ago tonight that I, as a young trick or treater, saw color TV for the first time. I'll never forget when that lady opened her door and there in the living room was a huge wooden TV cabinet displaying a COLOR picture! (CT-100??) I don't think I even knew color TV was possible before that night. It was 10 years later when we finally got a color set.

Anyway, I removed the Horiz Output tube, plugged all of the coils and speaker, connected a few voltmeters and ammeters and started cranking the variac. I think it has been at least 15 years since this chassis had power applied. At about 90 volts I heard noise from the speaker and kept going to 115V. Voltages and currents did not seem out of line. I rotated the tuner one click and there was audio from the newscast! A little rotation of the fine tuning control brought it in perfectly. It is always a great feeling to have a set come back to life but this one feels better somehow.
QUOTE]

Hi Tim, That must have been some incredible moment to see that color set working as a boy. Did the lady invite you in to look at it? Do you remember what program you saw? Did you ever go back to see if the set was still at the house? Where did you find the set you have?
Thanks

Make sure the diode-connected half of the 6AN8's in the AFC circuit are good. I had one start okay but slowly drift into oblivion in a few minutes. The AFC circuit seems to be rather forgiving. That scope-based procedure where you balance a slowly varying dc level works unexpectedly well. I have made a nice video of it and will take a DVD of it to the next ETF convention. The AFC balance pot seems to be a bit of a nebulous adjustment though; I set it to center; maybe because the lock is so tight, there is not much affect when adjusted. Again, the AFC / reactance tube / crystal oscillator, etc. loop can be quite stable and hold the hue adjustment constant from day to day.

If the signal to noise ratio is low and the video is noisy (not 'fuzzy' as when the fine tuning is not properly adjusted) and the signal source is okay, and it happens on one or two channels, tweak the tank(s) in the mixer circuit in the tuner (the first adjustment hole is the LO, the rest are the mixer then the rf amp).

I can make immediate use of that second 6200uh/6700uh coil from Terry if you don't need it.

Pete

No time to work on the set today, thanks for the tips Pete. PM or e-mail me your address and I'll send you the coil.

Bobby:

Thanks for the comments and interest.
I think I went in the house for a minute or two. The man of the house was sitting in his easy chair but I do not remember what show was on, I just remember seeing the color. I may have seen the set again in subsequent years but my only memory is of the first. I have no idea what became of that set. The set I have now, I acquired through an ad on Steve's ETF site.