Tube ID

[timmy]

This tv is making me nuts it's all recapped and yet I cannot find anything wrong, resistors are not perfect but are still in the area verticle output and oscillator transformers check good ohms. The oscillator pins 6 and 7 have no activity at all . Pin 6 has 7 volts which should be 90 volts and pin 7 has negative .770 volts which should be negative 26 volts pin 2 of the same tube output side has 25 volts which is ok having 21 volts . So it seems there is a clear problem with the oscillator section and I concentrated on that area resistors and find nothing. Where there supposed to be the high voltages there is. I subbed the hold pot, height, and linearity pots still nothing just a horizontal line. I'm sure the voltages are simply not there because the tube is not conducting at least I think that's the voltages that are in the SAMs as a working set. The SAMs I have is a speck different but everything I checked already matches the SAMs I have if a resistor shows otherwise I check it anyway. I don't know if the yoke is needed for the oscillator to run but I just as well look into the yoke although nothing is burned visually.

[Electronic M]

With the yoke and CRT connected try connecting the osc grid to the heater line through a .1 if cap and if that doesn't give deflection then try connecting the output grid to heater voltage.

Transformers can have shorted turns...When that happens resistance can still be exactly normal but the transformer won't oscillate or pass signal normally.

[timmy]

Ok pin 2 with the .1 cap to heater the screen opens about 2 inches pin 7 it opens less then an inch. So there was Alittle deflection. So what might that mean, a bad oscillator transformer ?

[timmy]

If there is 2 different SAMs for this set then maybe the ohms would be different I really don't know because I have the SAMs that you posted in an earlier post and the part number for the oscillator trans I have here is A10106-1 but the SAMs shows PB10106-1 close but I don't know if I could use that one with the PB instead of the A if this trans is found to be bad.

[timmy]

Ok so I located a verticle oscillator transformer and hopefully this will cure the problem since spending days checking resistor , voltage sources, is making me nuts without finding anything. I have good sound and it has a picture that I can see changing in the horizontal line so at this point it's verticle or nothing.

[timmy]

Ok so by adding a .1 cap to the heater source to pin 2 grid of the verticle oscillator gives me Alittle verticle deflection, what does this mean, a bad oscillator transformer or a missing voltage source because I am out of ideas on how to get the verticle running. I do have the oscillator trans coming but I'm still looking around for other possible causes in case I put the trans in and that don't work, so I'm trying to be Alittle ahead of it. Any little help would be appreciated.

[timmy]

Ok well another dead end got a nos verticle oscillator transformer and of course still no verticle. I have went over a lot and I do know I'm missing something here and it should be obvious but I'm not finding what's going on here. So now I'll check voltages on neighboring tubes tied to verticle.

[EdKozk2]

Hi Timmy,
Do you have an oscilloscope ? If you do check for the waveform at the grid of the vertical output portion of the 12bh7. If you do then your blocking transformer should be O.K. If there is a correct waveform at the grid then check for a wave form at the plate of the 12bh7 vertical output. If you get a wave form , then disconnect one of the leads from the vertical deflection coil. then test for a waveform on the secondary of the vertical output transformer. If you do get a waveform then you may have a problem with the yoke.
Ed

[timmy]

Originally Posted by EdKozk2

Hi Timmy,
Do you have an oscilloscope ? If you do check for the waveform at the grid of the vertical output portion of the 12bh7. If you do then your blocking transformer should be O.K. If there is a correct waveform at the grid then check for a wave form at the plate of the 12bh7 vertical output. If you get a wave form , then disconnect one of the leads from the vertical deflection coil. then test for a waveform on the secondary of the vertical output transformer. If you do get a waveform then you may have a problem with the yoke.
Ed

No I don't have a scope, I'm flying solo here, lol.

[timmy]

Hey tom, could you please tell me what the SAMs set and folder number is of the schematic with the 12bh7 tube, v8 , if you have it , the SAMs I have is with the 6u8 , v8 , there are obvious differences and I'm not getting anywhere without the right SAMs. Maybe I can find it with the right number. Thanks. Tim

[Electronic M]

Originally Posted by timmy

Hey tom, could you please tell me what the SAMs set and folder number is of the schematic with the 12bh7 tube, v8 , if you have it , the SAMs I have is with the 6u8 , v8 , there are obvious differences and I'm not getting anywhere without the right SAMs. Maybe I can find it with the right number. Thanks. Tim

I did give the set number that contains it before...See link for full number.
https://www.samswebsite.com/en/photo...earch&s=Search


The Sam's sites search function is something every collector that uses Sam's should be familiar with...I use it instead of my paper copy of the index because it is faster. You now have been taught how to fish (for Sam's numbers).

[init4fun]

Originally Posted by Electronic M

...... You now have been taught how to fish .......

Just like the old saying goes "Give a man a fish and he'll eat for a day , , , ,

, , , teach a man to fish and , ,

and , AND , AND he'll sit on his ass all day on the boat drinking beer with his buddies and not get anything done around the house

Oh , wait , that was the X who used to say that , nevermind .....

[Electronic M]

Originally Posted by init4fun

Just like the old saying goes "Give a man a fish and he'll eat for a day , , , ,

, , , teach a man to fish and , ,

and , AND , AND he'll sit on his ass all day on the boat drinking beer with his buddies and not get anything done around the house

Oh , wait , that was the X who used to say that , nevermind .....

LMAO...the bad X's version of a proverb about knowledge and self sufficiency.

[timmy]

Ahh , ok , I don't fish anyway , lol

[timmy]

Oh and tom, there seems to be 3 versions there are 2 214 that is listed they have different item numbers so I'm not sure but I guess start with the one that hopefully has the right tube.