Okay, can't move forward until I clear this up

[TinCanAlley]

Originally Posted by DaveWM

opps nver mind, I was looking at the 18k on the service switch and yes you would need to lift the 1.8k ground 1st then with the ser swich in normal you should be able to read them both.

One thing to remember, IF you do not heat sink the lead AND if you use a lot of heat to unsolder them, THEN its possible that you may heat damage them causing a drift upward that was not there before you lifted them. So use a heat sink to be on the safe side.

I have a clip on heat sink for the leads. I plan on doing this over the weekend as I'm expecting a batch of resistors to arrive. Figure while I have the chassis removed, I'll check a number of other in and around the drivers.

Oh, and I don't know why I didn't see it before in Sams, but I did the resistance checking for all the transistors. All of them were within 10% of values given with most of them pretty much dead on. I'm attaching what I used incase you're wondering what I'm talking about. I did checked each to ground (same ground point for all).

[old_tv_nut]

Originally Posted by Electronic M

the one for my hybrid has monochrome video to the g1s and the color difference signals to the cathodes.

If this is true, it's the first time I've heard of a design like this. Tube sets for years (and I thought hybrids also) put color difference on G1s and mono on cathodes. Then CRTs got unitized guns (common G1 for all three colors), and the color had to be matrixed into three cathode drives (R,G,B).

Edit: besides, TCA's schematic clearly shows fixed voltage on the G1s.

[zeno]

Originally Posted by old_tv_nut

If this is true, it's the first time I've heard of a design like this. Tube sets for years (and I thought hybrids also) put color difference on G1s and mono on cathodes. Then CRTs got unitized guns (common G1 for all three colors), and the color had to be matrixed into three cathode drives (R,G,B).

Edit: besides, TCA's schematic clearly shows fixed voltage on the G1s.

I think it started on Zeniths in A or B line, 19-25". I think
the 14 & 16" used a triple triode & I dont remember where it was
mixed. Cant remember what others used it, been to long.
Maybe I will look at a few Sams tomorrow to refresh.

73 Zeno

[old_tv_nut]

Originally Posted by zeno

I think it started on Zeniths in A or B line, 19-25". I think
the 14 & 16" used a triple triode & I dont remember where it was
mixed. Cant remember what others used it, been to long.
Maybe I will look at a few Sams tomorrow to refresh.

73 Zeno

thanks - will be interested