#181
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#182
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And the best part is that you can keep your beer cold in the cooler while you work!
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#183
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But it will be tough to get at...
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#184
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I do the same thing, but I use a sturdy stool instead of a cooler. Makes everything so much easier for sure!
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#185
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I replaced the CRT with a 21FB that is a bit stronger. It displays a beautiful picture with all colors strong except for red which is weak. This has do to a problem with the circuitry driving the red cathode. I have been tracing back through the circuit and have been finding resistors that have gone off. I think I will tackle this problem before I continue on the color sync issue.
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
Audiokarma |
#186
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Im starting to really think the replacement crystal may be bad since it does have a big dent in the side of it (Must have occurred during shipping) and I cant seem to get the color to lock no matter what I do. With the last crystal I could get the color to lock I believe. I will swap the crystal once I can find one. Work has been slow this whole year and I admit I have been lazy with the restoration of this set and have not worked on it as much as I should have. Summer is coming up soon so I hope to have the set finished by August. Slowly but surely this set is shaping up!
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#187
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Sounds like you're nearing the finish line!
If you have a signal generator and scope, you can do a bench test of the crystal. In my CTC-4 article, scroll to the section titled, "Bench Testing the 3.58-MHz Crystals": http://antiqueradio.org/RCACTC-4ColorTelevision.htm Thanks to dtvmcdonald for that tip. Phil Nelson Phil's Old Radios http://antiqueradio.org/index.html |
#188
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From what I am gathering, I think the crystal may be bad. I have it setup to be bench tested. I'm not seeing a real big change in amplitude when I get around 3.58. First picture is at 3.58 and second is way down around 1mhz. This is what I believe the change should look like https://antiqueradio.org/art/RCACTC-...lAnimation.gif
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#189
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Any thoughts? I believe the crystal is bad, but I'd like some advice before I go out and buy one.
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#190
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They're cheap - get one or a few
http://www.newark.com/raltron/a-3-57...49u/dp/96F2798 |
Audiokarma |
#191
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Cant go wrong at 58 cents. Ill pick one up soon and go from there. I now have a whole lot of time to work on the set now. I hope to get it wrapped up by august.
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#192
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New crystal is in and I can see a bit of improvement. Still cant get color to lock. But I can faintly see color through the rolling bars. Black and white picture is perfect I just cant get this pesky color to lock. I have tried putting caps across the crystal but I cant seem to get the frequency below 3.57900 (with a cap across the crystal). Reading through Phil's article on his 4 reveals that a 100pf cap can be put across L142 I believe. This TV wants to produce color, it is so close! Should I add a cap across L142?
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#193
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Quote:
Edit: oops - I see you meant 3.57966 - still high. Last edited by old_tv_nut; 06-27-2017 at 10:58 PM. |
#194
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More C across L142 is easy and worth a try, I think.
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#195
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Yes right, my bad. I can get it down from 3.57966 to 3.57900 with a cap across the crystal.
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
Audiokarma |
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