Ts18 verticle problem

[jr_tech]

C-75 could be shorted, but I doubt that the horizontal would work ok if it was... a real head-scratcher.

jr

[timmy]

Originally Posted by jr_tech

C-75 could be shorted, but I doubt that the horizontal would work ok if it was... a real head-scratcher.

jr

That's a 900mmf that cap along with the other Micas were changed but each one I replaced I tried the set and after all of them were replaced I was left with the same problem. I checked the horiz afc and block trans and ohms are perfect. So I don't know what it is with pin 2 or if it even has to do with this odd problem.

[Electronic M]

Could the blocking trans have a primary to secondary or windings to frame short?

[timmy]

These transformers are small round things dipped in wax and the one trans is on a tie strap and the other is in a can on top and I took that apart and that one has insulating paper wrapped around it. So I guess it's safe to say I don't think there is a winding short to ground unless the ground was leaking in from somewhere else , I don't even know where to start to look for a possible ground leak into the verticle, and There is no 60hz hum in the audio.

[timmy]

Still didn't figure this out, but there is 2 10meg resistors at the 6sl7 that I checked and also tried others and didn't work was the same no different but the one 10meg that is across pin 4 and 6 if I put a 1 meg across the 10meg I get a picture and vert hold the linearity is off on top and the hold is Alittle touchy. pin 6 is wired for ground and the one end of the .004 is also tacked to ground. It seems as if the tube is not conducting by why with a 1 meg it calls for 10 meg. If I try a 1 meg across the other 10meg it works very little bad picture and no response from vert hold or size. All this changes with the one resistor at 4 and 6 . I can't measure the voltage on the plates of the 6sl7 with a Dvom I won't get an accurate reading but measuring I do get a reading of 120 Vdc and 75 Vdc the SAMs shows a lot more so my meter won't tell but changing that resistor to a 1 meg I'm thinking lowering that resistor seems to allow the tube to conduct with possibly low voltage on the plates but the screen is super bright. The plates get voltage from the hv with the resistors which check ok. This is nuts already, I'm open to anything at this point

[jr_tech]

Have you tried a different 6SL7? Possibly this one has grid emission.

Could there be a carbon path in the tube socket between pins 5 and 4 that is pulling the grid more positive than it should be?

You really need to get better voltage measurements... can you get another HV probe or fix the one you have?

jr

[timmy]

Originally Posted by jr_tech

Have you tried a different 6SL7? Possibly this one has grid emission.

Could there be a carbon path in the tube socket between pins 5 and 4 that is pulling the grid more positive than it should be?

You really need to get better voltage measurements... can you get another HV probe or fix the one you have?

jr

I tried several 6sl7 no change as for my hv probe tossed it last year could not fix it. Carbon path , well anything is possible but I need to find out how to know if there is a carbon path taking place befor I get into changing that socket. Do you have an idea how to determine if there is a carbon path. I don't here anything arcing nor do I smell any corona from hv. Pin 5 SAMs shows 320 Vdc and I find odd that the 6.8 meg at pin 5 gets warm but the other 6.8 don't.

[jr_tech]

I would unsolder all of the connections to either pin 4 or pin 5 and mesure resistance between the two pins... leakage as high as 10 meg or so could mess up the bias on the tube.
You really need to get another HV probe, as low HV could be te main source of the problem.

jr

[timmy]

Originally Posted by jr_tech

I would unsolder all of the connections to either pin 4 or pin 5 and mesure resistance between the two pins... leakage as high as 10 meg or so could mess up the bias on the tube.
You really need to get another HV probe, as low HV could be te main source of the problem.

jr

I thought maybe low hv but the crt is super bright and I tried adjusting the ring on the 1b3 and of course no change. Should the tube remain in the socket when I remove from one pin and test?

[timmy]

This is what happens when I put a 1 meg across the .004 cap and if I measure across the resistor there is around 3 volts dc I'm also showing 2.7 volts ac as well.tried another .004. With out the resistor can't see a pic and nothing works. Almost seems maybe ground leakage or ac getting to ground and the resistor kills it enough to work Alittle, ah I don't know.

[EdKozk2]

Timmy,
I compared the Sams schematic to the Riders for the TS-18 chassis. There seem to be a few differences and maybe errors. I' ll use Sams part numbers. Resistor R-59 should be 22 meg not 2.2 meg. Resistor R-56 is shown as 150K ohms not 100k. Also make sure C-61 through C-68 are the correct replacements,
voltage and tolerance wise. If trying these changes don't slow down the vertical then you can try increasing the capacitance of C-64.
Ed

[timmy]

[QUOTE=EdKozk2;3181220]Timmy,
I compared the Sams schematic to the Riders for the TS-18 chassis. There seem to be a few differences and maybe errors. I' ll use Sams part numbers. Resistor R-59 should be 22 meg not 2.2 meg. Resistor R-56 is shown as 150K ohms not 100k. Also make sure C-61 through C-68 are the correct replacements,
voltage and tolerance wise. If trying these changes don't slow down the vertical then you can try increasing the capacitance of C-64.
Ed[/QUOTE
Well it is a ts18 but the resistor I pulled out judging by the colors was a 2.2 and it's weird that the riders would say a 22 meg goes there. This chassis was never touched it had all the old wax caps and where r56 is it's definitely original 100k and the Micas don't show a voltage but the Micas I put in are the same ones in my other tvs , ts4d, ts18, and so on and are rated for 500 v and may be a few rated for 1000 v other then that all the caps that replaced are 600 v .

[jr_tech]

Resistor R-59 should be 22 meg not 2.2 meg

I think you found the "red X".... just checked the Sams schematics for VT 71 and 73 and they both have 20 to 22 meg at that location.

jr

[timmy]

Originally Posted by jr_tech

Resistor R-59 should be 22 meg not 2.2 meg

I think you found the "red X".... just checked the Sams schematics for VT 71 and 73 and they both have 20 to 22 meg at that location.

jr

The resistor I took out was original and if it were an original 22 meg resistor I don't think it would have measured a perfect 22 after all the years I would have thought it would have been up around 25 or 28 meg. My SAMs I got from early television and r59 shows 2.2 meg so I'm now really confused.

[EdKozk2]

Timmy,
The parts list in the Sams shows 22 meg, but the schematic is most likely incorrect.