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#121
03-12-2012, 10:55 PM
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Quote:
OK, ok, ok already!  I had to replace more parts to get to this point though, turns out the 'I' section of the chroma channel was completely dead. That ended up being, surprise surprise, another bad peaking coil. This time it was the one feeding the 'I' phase splitter, which led to complete lack of 'I' information to the matrix. The clue was the 'I Gain' pot having no effect on the picture, and the colors being generally messed up. Replaced it with one of the ferrite spares I had floating around, and it perked right up. Still remaining is the IF alignment, which I totally screwed up earlier. I think I'm going to have to use the mod marker function of the 415 to tune all the coils independently first, then move on to a regular alignment to finalize the response. That will allow me to finally get some DVR stuff on the screen, to see how well it really performs. I'm also noticing a slight drive line in the picture, even though the pot is at minimum. I'll probably have to change some values under the hood to get it a tic lower, so the line will go away. Other than that, it's looking pretty good if I do say so myself. 
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Evolution... 
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#123
03-12-2012, 11:22 PM
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Nice to see another CT-100 brought back to life.
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Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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#124
03-13-2012, 07:24 AM
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That deserves to be on a magazine cover. So bright and sharp. SWEET!!!
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#125
03-13-2012, 11:15 AM
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Looks very promising.
You are showing incredible restraint in not hooking up a DVD player yet. I doubt I could have waited this long to see some motion on the screen, hear some sound, etc. Phil Nelson
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#126
03-13-2012, 01:22 PM
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Something simple to check: Some CTC2 schematics incorrectly show the HO coupling cap [mounted above chassis next to the drive pot] as 0.01 uF, where the final design value is 0.0015 uF. That alone can cause an overdrive line if there's a 0.01 instead of the correct 0.0015 (or. of course, a 0.001 uF is good too). Pete Last edited by Pete Deksnis; 03-13-2012 at 01:30 PM.
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#127
03-13-2012, 01:26 PM
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Niiice!
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#129
03-13-2012, 04:03 PM
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Beautiful CT-100. I'm just thrilled to see these sets alive again!
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#130
03-13-2012, 04:32 PM
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You are the oracle, Pete! I was unaware of this, but I checked the chassis and it has the correct .0015uf in it. I could try a slightly weaker horizontal osc tube before making circuit changes, less output=less drive. If that doesn't work, I'll have to fool around with the parts.
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Evolution...
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#132
03-14-2012, 08:04 PM
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I finally got around to adding a CT-100 page to my site, it can be viewed at the following link:
http://miniman82.4t.com/custom4.html
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Evolution...
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#133
03-17-2012, 11:10 AM
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Beautiful! A video time machine for sure.
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#134
03-17-2012, 05:26 PM
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A nice time machine. Love that Lollipop color. Beautiful CT-100. Top of the Merrill crop. Thanks for sharing your journey.
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#135
03-17-2012, 07:49 PM
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Those are the best looking bars I have seen. Most CT-100s start out too blue, which is easy to do because of the wide difference in drive/beam current needed in the red gun to make illuminant C (daylight white). The green usually requires a bit more current than the blue also, I believe. There also can be weak tubes in the matrix that mess up the color. As was heard in the Zenith lab when RCA introduced the early chassis, "27 controls, each one making it worse!"
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Linear Mode
