Starting work on the Sylvania 7140M

[jeyurkon]

Originally Posted by Eric H

I posted a short video showing what's happening with this set. http://www.youtube.com/watch?v=C9HuJxELL6c

In other news, this set uses one of those integrated circuit type Vertical Integrator things, looks like a large flat Ceramic Disc cap, anyhow the center leg of it is broken completely off the component, I would expect this to only affect the Vertical section since the Sync for the Horiz is taken off immediately before this section.

I can poke the leg back into the hole and it makes a very slight difference in the Vertical but has no apparent affect at all on the Horizontal.
I suppose I'll have to build one of these out of individual parts, it seems to be a very typical Vertical circuit with the 8200 ohm resistors and some small value caps.

It makes so little difference Mad Man Muntz would just cut it out and leave it that way.

I've attached the instructions for adjusting the phase and... It's from a different model, but the procedure is the same.

If V17 the 6AU6 has any grid leakage at all you won't be able to make the adjustment work. Most tube testers won't have enough sensitivity for this test and you need to use a leakage tester.

This set doesn't use feedback from the flyback to control the phasing.

John

Uhh, I just realized the numbers are different. Where it says R90 it should be R226, the ringing coil is L63. B1 should be sticking out the back of the set and B3 should be in the same transformer, but on this inside.