Ts18 verticle problem
Ok this ts18 I recapped and upon trying for the first time the hold pot was maxed to keep from rolling then after Alittle while the roll started and now has got so bad that the pic can hardly be seen, just massive lines and jumping. So I changed all Micas in the vert and horiz no change. So I already went over resistors in the beginning and changed 2 resistors and there are no more resistors out of tolerance still no change. Checked the vert size and hold pot resistance is good . I'm sure I'm missing something here if anyone has an idea what's going on with this please I'm all eyes. The crt is bright so the hv is ok and also subbed tubes in the vert and horiz nothing works. What I did do is I was able to get the roll to stop and almost a full screen by placing a .01 cap from ground to pin 4 of the 6sl7 at the 100k resistor which is good also. So I don't know maybe a ground leak to something in the vert but where. The horiz is perfect. The lines look like retrace lines without the mod. I'm lost here. Is it possible for a resistor to check good out of circuit but in the circuit change drastic value.
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Did you replace the high voltage caps with tubulars? When I did my TS-18 chassis I used ceramic discs and they did not work well in the vertical. I would check every resistor and cap in the vertical oscillator and output circuits. Also check for wiring errors. Despite being careful, it does happen. These chassis perform well when restored.
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There are 2 10meg resistors that I changed at the 6sl7 and put in 2 1meg resistors mistakenly , and some how I have verticle hold close to maxed on one end but the vert size is almost maxed to fill the most of the screen. So I'm wondering if because I'm using ceramic disc caps instead of tubular could this be messing up the verticle and size because there is not enough capacity. And the wrong resistors I put in maybe they accidentally made the wrong caps work. Because these sets are known to work with disc caps mine seems to be the exception to other sets like this one.
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Put the right resistors in, check and if it is still not right loose the ceramic caps, then check back.
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Horizontal runs at a much higher frequency so you can usually get by with ceramics. Ceramic will definitely give you problems in the vertical unless you use a much larger value then specified.
Tom used 0.01 uF caps with good results. You can read all about it here: http://www.videokarma.org/showthread.php?t=260749 |
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Yes
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well I need some direction here with this ts18 verticle problem . After changing all Micas in the vert section and horiz and recapped all else the weird thing I have going on here is not only can I not find any bad resistors anywhere and the b+ and b++ is right on the money but there is lines jumping all over and really can't see any pic but if I take a .01 cap and parallel it to the .004 at the 6sl7 I have vert hold and almost a full screen except for some linearity loss and a great picture. One end of the .004 is ground .
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Have you changed the 2 resistors in the vertical back to the correct value (10meg) ?
jr |
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That .004 cap has to be exactly .004 mfd. Try another .004 cap
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Here is what I have you can see a picture in there but there's to much roll that cannot be adjusted. I even adjusted the hv ring thinking maybe low hv but no change. Sorry the iPad flipped the image.
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