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#32
03-02-2012, 10:44 PM
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Finally found some time to get back to this. It has been to long.
Well I was thinking about what ctc17 asked me about there being no green. I tested the 21fj when I first got the set and only the blue gun looked weak it would get better when the filaments were on for about an hour and then re-checking. This was with an old beltron tester. I got a sencore 7000 and re-checked the tube about the same no g1 or hk shorts,cutoff passed,and emission hi tracking passed.  Next I found a rca test jig 10j106 and tried the chassis on the bench. I had to make the crt plug adapter from tube base pins and a brightner socket but it works. I have color on the test jig just turned a16 1 turn in and it locked. Great I have color-----but when I hook back up to the 21fjp22 IT is still the same  as before color is all wrong.I found pin 6 of the crt socket loose and tightened it (no good) The crt passed the tests on 2 different testers and the chassis makes color on a test jig but they wont work together. 
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#34
03-02-2012, 10:49 PM
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Just a SWAG here, but did you degauss the 21" and check the purity rings?
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#36
03-02-2012, 11:08 PM
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purity is a must do. Dequass ground the G1s thru 100k reistors (you need 2 one for each G1). Cut off the G and B and see if you get a uniform red raster. If not you will need to do the purity setup. Be careful when sliding the yoke around with the power on. the windings can bite....
Generally if purity is a issue the colors of reg programming will be off depending on the location of the screen (so if you had a green field, some of it will be green with other areas not so much. If you suspect Green then use the resistors to cut off the R and B guns. You can also just turn down the screen drives, but I like the resistors as I dont like constantly adj the G2 drives. oh and start out with the G and B G1 drive pots at max, refer to the gray scale setup for the exact procedure. be aware that adj the convergence and purity interact, so you want the purity set right 1st before spending a lot of time on convergence. You will have to adj things a few times to get the best performance.
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#38
03-03-2012, 03:20 PM
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The pics are red,green,and blue. (LOL)
Pic 1 g1 of green and blue grounded pic 2 g1 of red and blue grounded pic 3 g1 of red and green grounded White raster fed with my leader gen. Programming from cable box has similar results (Do I need a 1000 amp 3 phase degaussing coil? lol)
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#39
03-03-2012, 04:13 PM
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The blobs of incorrect color look like classic bad purity to me. The Sams manual should have a section on purity adjustment. Work through that as Dave suggested.
Phil Nelson
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#40
03-09-2012, 05:11 PM
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Well here is a pic of it after a quick purity setup and degaussing.
 It gets better the longer it runs. I have been using it for about 2 hours and it seems ok at 189mA cathode current. Until it goes through a cold start and the auto gedauss is used. It kills the purity again. Unplug degauss coils and it will be fine over several startups. So I am thinking the thermistors,varistors are of the incorrect value ? Causing current flow to be to abrupt (on/off)magnatizing the crt ? The coil measures 9.6 ohms
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#43
03-10-2012, 01:30 AM
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Quote:
__________________
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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#45
03-12-2012, 01:27 PM
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Nice Picture Rob. I miss all the 16's I worked on for friends who used them as daily drivers. First year for a UHF tuner as standard equipment. Life was good in '65
One thing I did not see mentioned is that a HV rectifier tube 3A3 should be replaced in kind, the 3A3B, C were a bit shorter and did not always fully seat into the flyback. Congratulations, I was secretly hoping your shadow mask wasn't warped.
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