Ts18 verticle problem

[jr_tech]

The tube shouldn't make any difference, unless it is the cause of leakage... try it both ways. You could also check the tube itself for any leakage between pins, but since you have tried several different tubes without changing the symptoms, it is unlikely that you will find any leakage unless they all have the same fault.

jr

[EdKozk2]

Timmy,
Did you ever try spraying any cleaner into the vertical hold and size control to see if it would stabilize the vertical roll? Did you try wiggling V9, V11, or V12 while the set is on to see if it helped? I come across worn and dirty contacts all the time in old equipment. The cause of all sorts of issues. Just because parts are swapped or tested doesn't always eliminate the root cause.
Do you understand how the vertical feedback loop works with this set? If you have a scope, check to see if you are getting the proper trigger signal to your vertical oscillator grid from the sync separator/ integrator network.
Ed

[timmy]

Originally Posted by EdKozk2

Timmy,
Did you ever try spraying any cleaner into the vertical hold and size control to see if it would stabilize the vertical roll? Did you try wiggling V9, V11, or V12 while the set is on to see if it helped? I come across worn and dirty contacts all the time in old equipment. The cause of all sorts of issues. Just because parts are swapped or tested doesn't always eliminate the root cause.
Do you understand how the vertical feedback loop works with this set? If you have a scope, check to see if you are getting the proper trigger signal to your vertical oscillator grid from the sync separator/ integrator network.
Ed

I did spray the verticle pots in the beginning thinking it would help but it didn't and yes I moved v9 ,11 , and 12 , nothing helped and I don't have a scope I'm an auto tech, lol so I wouldn't have that for a tv but I have 4 other of these sets I have done and never came across something like this I mean these sets are kind of simple but this problem is kicking my ass. I replaced every mica in the vert and horiz along with all the wax caps were done. After the wax caps fired up and the vert went down hill fast and since then I did the Micas one at a time to hoping to find the one culprit but after replacing all I'm still left with this problem. I checked to see if any carbon shorts in the 6sl7 socket and none showed up. And all the 6 kv caps new also. Just don't get what's going on I am out of areas to check. In the beginning it seemed like a resistor went up fast but I only found one 2.2 meg that went up to 22 meg so I changed it and the 2- 6.8 meg resistors at the 6sl7 measure around 7.5 meg not all that high since I think my other sets were around there to but they work . And thinking one was breaking down in circuit I subbed them and still make no difference. I also subbed the vert size and hold pots no change. And also moved v10 the oscillator no change.

[EdKozk2]

Tim,
Since you don't have a scope you could try to isolate the trouble better. Disconnect/ unsolder C61 250mmf from pin 4 of V9. Leave C61 disconnected and then turn on the set. The picture should roll but, see if you can adjust the vertical size, if so set it. Next see if the vertical hold control has any effect on the vertical roll. If you can get the vertical roll to almost stop with the vertical hold in mid-position thats good. If the vertical hold has no effect or won't slow down enough then the trouble could well be a bad cap or resistor. The bad cap or resistor would determine the time constant the free running vertical oscillator frequency.
If the vertical roll can be slowed down and controlled, then I would next start checking the output of the sync separator. Try connecting a voltmeter set on AC volts, high range to start, to the end of the disconnected C61. You should be getting an AC voltage reading of some sort. You may have to adjust your voltmeters range downward to get a better reading. If there is no AC voltage present then the trouble is syn related. The integrated sync pulse voltage is what your trying to measure. Try these steps and let us know the results.

[timmy]

Originally Posted by EdKozk2

Tim,
Since you don't have a scope you could try to isolate the trouble better. Disconnect/ unsolder C61 250mmf from pin 4 of V9. Leave C61 disconnected and then turn on the set. The picture should roll but, see if you can adjust the vertical size, if so set it. Next see if the vertical hold control has any effect on the vertical roll. If you can get the vertical roll to almost stop with the vertical hold in mid-position thats good. If the vertical hold has no effect or won't slow down enough then the trouble could well be a bad cap or resistor. The bad cap or resistor would determine the time constant the free running vertical oscillator frequency.
If the vertical roll can be slowed down and controlled, then I would next start checking the output of the sync separator. Try connecting a voltmeter set on AC volts, high range to start, to the end of the disconnected C61. You should be getting an AC voltage reading of some sort. You may have to adjust your voltmeters range downward to get a better reading. If there is no AC voltage present then the trouble is syn related. The integrated sync pulse voltage is what your trying to measure. Try these steps and let us know the results.

Ok I took the leg of c61 250mmf off and the size has very little affect and the vert hold also it's hard to see anything it's rolling so fast the hold I can see it slows Alittle from one end to the other on turning the pot the same for the size pot. I checked the cap pin for ac volts and I get .300 vac jumping around a bit. If there is a bad cap I may put in or a resistor I may have missed do you have an idea which one It might be. Maybe I put in a cap that is detective .

[kvflyer]

If you can't get the vertical to stop rolling with the hold control, (with the sync pulse disconnected) it seems as thought he vertical oscillator is off frequency. You should be able to get the picture to get close however, it needs sync to lock in.

You might check the capacitors in the oscillator circuit to be sure the correct value is there. Also, resistors for one that may have gone high in value or maybe one that was replaced with a value that is 10 off (Like 270KΩ instead of 27KΩ or .01 ᶙFD instead of .001 ᶙFd).

Just a thought. I realize how maddening it is!