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-   -   Help Please! with an RCA CTC-9A (http://www.videokarma.org/showthread.php?t=109380)

jhalphen 04-20-2007 08:13 AM

Help Please! with an RCA CTC-9A
 
2 Attachment(s)
Good day to All,

I am seeking help for my French friend Wilfrid who is trying to restore an RCA CTC-9A color TV to working order. I will translate & pass on to him the infos.

The TV is complete, not recapped. Caps were sample tested with an ESR meter and appear to be in quite good condition. The set was brought up on a variac and produces a raster and some sort of video. We have the complete SAMS manual and a full set of spare tubes. H out 6DQ5 was replaced as the original tube was severely gassy.

In the 2 pictures shown here, the RCA is fed from the Aurora converter outputting monochrome 525/30 via a Steren 203-103 NTSC VHF Modulator.

My first question is: Could it be that the RCA is unhappy receiving a signal with no color burst ? i've asked Wilfrid to play a DVD in 525/30/3.58 MHz through the modulator to see if we get color. Will post results.

In the meantime, Thanks! in advance for any help/suggestions.

Best Regards

jhalphen

Don Lindsly 04-20-2007 10:27 AM

That TV will play fine on a black and white NTSC signal. From your picture I suggest setting up the color bias controls for grey scale and trying the AGC to increase contrast. If that does not make a significant improvement, then some troubleshooting is in order. Check chroma driver tubes as well.

andy 04-20-2007 11:58 AM

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oldtvman 04-20-2007 03:10 PM

The basics first
 
Before assuming any type of color problem always make sure the purity and gran scale are correct. Turn down both blue and green screens and background controls and them set the purity to a pure red screen. Then bring the other color up to achieve gray scale. The other problem with those sets are burnt resistors in the screen circuits and leaky caps. Then can mask the problem and have you chasing your tail. After setting the bascis, check all screen voltages on the crt and make sure they are correct. If the crt is good the problems should be resolved

oldtvman 04-20-2007 03:10 PM

The picture on my avatar is on a ctc 9


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