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  #1  
Old 01-26-2018, 11:19 AM
iong iong is offline
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Rca ctc-53x

Just got a RCA model EX 417WR Remote control tv with CTC-53x Chassis. Uses low voltage focus crt 18VDP22. I have poor focus and not sure how to correct this. There is no focus pot however the wire leading from the focus pin of the crt has three placement positions. One pos. is 0 volts another is 310V and last is 790v. There is a resistor inside the picture tube socket and measures correctly. The 0 volts provides best focus but still out of focus. The high voltage is higher then normal about 22k. There is a strap that can be cut to make high voltage higher according to RCA service guide. Voltage 22k when strap was attached. 25k not straped. Hoping someone can help with this focus problem.
My line voltage is a little high around 123VAC.
Perry
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  #2  
Old 01-26-2018, 12:03 PM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by iong View Post
Just got a RCA model EX 417WR Remote control tv with CTC-53x Chassis. Uses low voltage focus crt 18VDP22. I have poor focus and not sure how to correct this. There is no focus pot however the wire leading from the focus pin of the crt has three placement positions. One pos. is 0 volts another is 310V and last is 790v. There is a resistor inside the picture tube socket and measures correctly. The 0 volts provides best focus but still out of focus. The high voltage is higher then normal about 22k. There is a strap that can be cut to make high voltage higher according to RCA service guide. Voltage 22k when strap was attached. 25k not straped. Hoping someone can help with this focus problem.
My line voltage is a little high around 123VAC.
Perry
I have one of those as well!
One of the forum members suggested a very mild rejuvenation. When those CRT's are a little weak, the focus isn't that great, even though the gray-scale might be good. I never tried it, your results may vary.
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  #3  
Old 01-26-2018, 02:58 PM
El Predicta El Predicta is offline
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Beltron would help.
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  #4  
Old 01-26-2018, 04:01 PM
zeno zeno is offline
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Almost always its the CRT. A LIGHT rejuve will perk things up
but low focus jugs need everything perfect to look good.
I would NOT use a Beltron on it. Its the brute force way.
Beg borrow or steal a modern checker from the 70's up that has
a "clean & balance" setting like a Sencore or B&K.
Also if this is the hybrid chassis watch out for resistors in the hoz osc.
The go up in ohms & eat horz outputs without any symptoms.

73 Zeno
LFOD !
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  #5  
Old 01-26-2018, 10:03 PM
iong iong is offline
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Ctc-53

Thanks members. I used my B k on clean and balance and now I have a decent focused picture. This is a striped down tv. I think RCA's version of a porta-color.
No HV Pot, No focus control, AGC, Blue, Green drive. series string. Surprised that the company known as the pioneers of color would produce this crappy set. Looks OK but not a performer. Nice it has remote control.
Perry

Last edited by iong; 01-26-2018 at 10:08 PM.
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  #6  
Old 01-27-2018, 10:53 AM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by iong View Post
Thanks members. I used my B k on clean and balance and now I have a decent focused picture. This is a striped down tv. I think RCA's version of a porta-color.
No HV Pot, No focus control, AGC, Blue, Green drive. series string. Surprised that the company known as the pioneers of color would produce this crappy set. Looks OK but not a performer. Nice it has remote control.
Perry
Every manufacturer had to have an "Entry Level" model!
I have the 14" version, CTC51X. The picture isn't quite as clear as it could be.
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  #7  
Old 01-27-2018, 03:47 PM
zeno zeno is offline
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If this is the all tube set ( also in 14") they are VERY tube hungry
& suffer from dried intermittent sockets too ! Its just to damn
hot in there.
I have taken a few of them & changed the low level tubes one at a time &
saw a small improvement with almost every one. When done if it
has a good jug the pix can be fantastic. ( you need a sleeve of 5GH8's !).
Compactron sets were the same way.......

Last one I did was a favor* set. Girl that worked at the Deli & made our
coffee every morn. She did have an awesome rack but her OM made more than I did. Boss said the tubes were obsolete so fill her up no charge. I did & that set came out SWEET !

* favor set. A set belonging to someone poor or down & out. ALWAYS
a dried up & worn out set, usually a console with a "beautiful" cabinet.
Guarantied to loose you $$ and have difficult problems. The word NO
has no meaning to the owner. And when done you charge a token fee,
about 1/10th the normal bill they dont even thank you !

73 Zeno
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  #8  
Old 01-27-2018, 07:19 PM
iong iong is offline
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Rca ctc 53

I guess it is an entry level set. Iv'e seen better and worse lower priced sets however the Toshbia's they sold in sears had nicer picture.
Perry
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  #9  
Old 01-27-2018, 08:26 PM
zeno zeno is offline
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Quote:
Originally Posted by iong View Post
I guess it is an entry level set. Iv'e seen better and worse lower priced sets however the Toshbia's they sold in sears had nicer picture.
Perry
The RCA wasnt a low end set. Brand new they looked great & cost
much more than a Sears / Toshiba. Pix quality was personal choice.
IIRC almost all were low focus jugs. Biggest problem with them were dirty tuners. Since you couldnt get at the tuners to clean them properly I
bought jig cables for them & pulled the chassis most the time to do
them right. All in all they were 10 times better than the Sears / Sanyo
sets they sold in parallel. Better than the Sears / Warwick also.
Over the years Toshibas were always a solid set. Never built a dog
that I remember except the very early ones.

73 Zeno
LFOD !
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  #10  
Old 01-28-2018, 11:22 AM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by zeno View Post
If this is the all tube set ( also in 14") they are VERY tube hungry
& suffer from dried intermittent sockets too ! Its just to damn
hot in there.
I have taken a few of them & changed the low level tubes one at a time &
saw a small improvement with almost every one. When done if it
has a good jug the pix can be fantastic. ( you need a sleeve of 5GH8's !).
Compactron sets were the same way.......

Last one I did was a favor* set. Girl that worked at the Deli & made our
coffee every morn. She did have an awesome rack but her OM made more than I did. Boss said the tubes were obsolete so fill her up no charge. I did & that set came out SWEET !

* favor set. A set belonging to someone poor or down & out. ALWAYS
a dried up & worn out set, usually a console with a "beautiful" cabinet.
Guarantied to loose you $$ and have difficult problems. The word NO
has no meaning to the owner. And when done you charge a token fee,
about 1/10th the normal bill they dont even thank you !

73 Zeno
You're thinking about the CTC22 using five 5GH8's and a tube IF and audio.
The CTC51/53 has a solid state IF and audio, except for the output stage. It uses only two 6GH8's and a few others that escape me for the moment.
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  #11  
Old 01-28-2018, 03:19 PM
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andy andy is offline
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I have a number of CTC53s and similar sets. They were RCA's last tube sets from the early 70's. When working they can produce a good picture, but they're by far the least reliable sets in my collection. Even after extensive work (mostly off value resistors and bad caps), they still have poor sync stability compared to other sets of the time.

I found a cleaning with my Beltron brought the CRTs back into focus.
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Wanted list:
RCA CTC-5
RCA CTC19 or 27
Sony KV-7010U
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  #12  
Old 01-29-2018, 09:02 AM
iong iong is offline
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Ctc-53

I now have good focus and brightness however my high voltage is 24k and I can't get it lower. Should be max 22K. Think I need to check resistors. I'll have to get a Sams. The RCA service manual has a slightly different 53x diagram.
Perry
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  #13  
Old 01-30-2018, 02:52 PM
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andy andy is offline
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I'd also check the film caps (particularly the orange drops). Mine had a number of caps that were way out of tolerance, or had completely failed. The orange drops were the worst offenders.
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Wanted list:
RCA CTC-5
RCA CTC19 or 27
Sony KV-7010U
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  #14  
Old 01-30-2018, 07:29 PM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by iong View Post
I now have good focus and brightness however my high voltage is 24k and I can't get it lower. Should be max 22K. Think I need to check resistors. I'll have to get a Sams. The RCA service manual has a slightly different 53x diagram.
Perry
How accurate is your HV meter?
I would rather have higher HV, than not enough. Two KV is not too high to worry about. If the rest of the set seems to work alright and focus is good, it should be OK.
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  #15  
Old 02-08-2018, 08:35 PM
iong iong is offline
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Ctc-53

There is a strap in parallel with a resistor on the Horz output board. This is the only high voltage adjustment. Rather the strap is connected or not there is no change in the high voltage at all so there is clearly something wrong. I guess i need to check the components but I need Photofact 1271. There are a few different CTC-53 chassis with slight differences in high voltage section.
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