1966 GE PortaColor Restoration

[Dubis7]

https://www.youtube.com/watch?v=dgot...ature=youtu.be

That's the primary overview. Sorry for the length, I was trying to make sure I caught everything.

https://www.youtube.com/watch?v=MQcN...ature=youtu.be

Here's when I removed the HV rectifier.

[old_coot88]

The ringing is probably mechanical vibration of the ferrite core of the flyback. It's usually curable by tightening those two nuts on the big C clamp that goes around the core (not too tight as the core can crack easily).

Your HV rectifier tube is good (if it was weak the raster would 'bloom' and fade out when you turn up the briteness).

The blue arcing when you touch the screwdriver to the glass and top cap of the HV rect is quite normal.

Insufficient height is usually a bad electrolytic coming off the cathode of the vert.output tube (although GE portacolors might not have this cap; other more knowledgable folks will chime in).

[jr_tech]

“Insufficient height is usually a bad electrolytic coming off the cathode of the vert.output tube ”

That would be c-2, which was replaced.... possible error?

jr

[Dubis7]

I checked C2 again. Still not finding an error.

Is there a specific section of C2 I should be looking at?

I did a few measurements by the way. I noticed my HV is hoving around 12KV when it's listed as being between 15 and 18KV. Also, my 670V boost voltage coming off of pin 3 on the flyback is measuring around 650V. Not sure if any of that could be related, but maybe that's a clue?

I tightened the core a bit. Ringing is gone, at least so far.

[Dubis7]

Does anyone have any thoughts on this?

I'm going to try replacing C1 and possibly C2D. I wonder if they didn't get damaged when I installed them incorrectly.

[Electronic M]

Originally Posted by Dubis7

Does anyone have any thoughts on this?

I'm going to try replacing C1 and possibly C2D. I wonder if they didn't get damaged when I installed them incorrectly.

Any lytic that has seen reverse polarity should be immediately round filed and unless you have equipment to test for leakage current at rated voltage.

[Dubis7]

Originally Posted by Electronic M

Any lytic that has seen reverse polarity should be immediately round filed and unless you have equipment to test for leakage current at rated voltage.

Hm. Well now I'm wondering if that's my issue with the height. C2D is definitely a potential culprit.

I had figured that if an Electrolytic didn't explode or smoke, it was fine. Obviously that's not true with the older dried out ones, but these are new. Perhaps I'm wrong?

I've got those parts on order. I'll see what happens when I swap them in. The rest of C2 should be okay.