77 sylvania

[DaveWM]

Originally Posted by Findm-Keepm

Dave,

What is the "power factor" you refer to - and how do you test it?

I've heard of value, ESR, leakage, and dielectric absorption tests for e caps, but this is the first I've heard of power factor.

Cheers,

I use an old heatkit condenser check (uses an eye tube, and a balanced bridge cirsuit for check caps) good of vintage gear esp leakage test at rated voltage, but can not check caps in circuit. there is a "power factor" adjustment, you turn to null the eye tube, which I think is about the same as ESR.

[Findm-Keepm]

Originally Posted by DaveWM

I use an old heatkit condenser check (uses an eye tube, and a balanced bridge cirsuit for check caps) good of vintage gear esp leakage test at rated voltage, but can not check caps in circuit. there is a "power factor" adjustment, you turn to null the eye tube, which I think is about the same as ESR.

Aw geez, now I gotta buy anudder piece of equipment. Jes' when you think you have everything.....

Thanks! I've got some old Heath stuff - I'll have to see what I've got stashed away. I may have one of them varmits. Probably similar to my Sprague tester's eye tube checks - some kind of reactance vs value check.

Cheers,

[DaveWM]

I think I may have found the vert prob, after going thru every cap (all good) I finally did a swap on one of the vert out transistors, but now the stupid converter box is on the fritiz so I cant get a signal to check it out on. I cant believe what pure junk these DTV boxes are, this is the second one that went out, less than a year old. I have other video RF sources, but it will have to wait for a bit.

I did a quick check last nite and it looked fixed, so I was going to check again this am.

[sampson159]

good job.those vertical transistors can have dirty socket issues.had more than a few.post more pics.the crt looks sharp and bright.

[Zenith26kc20]

Watch out for the vertical controls. I have replaced many of them for the problems you describe.

[DaveWM]

the little pots on the back of the pcb? should I try an test them in circuit?

I have cleaned the transistor sockets, and the serv switch.

[DaveWM]

I guess the smart thing to do would be to touch those pots when it acts up...