Another Westinghouse H840CK15

[old_tv_nut]

Originally Posted by trinescope

I finally found the color sync problem, it was due to flaky ceramic capacitors in parallel with the 3.58MHz oscillator coil.

Hooray!

Originally Posted by trinescope

I do have what looks like a bit of ringing in the picture, but it's really not noticeable most of the time. The signal looks great coming from the video detector but has the ringing at the delay line, and it seems to be the 6BK5 line driver stage that has the potential problem, or at least it was designed with this kind of response.

If the ringing appears at the input of the delay line (plate of the 6BK5) and there are no off-value components there, then it may be designed in, a result of the 3.58 MHz trap in the cathode. If you have a DVD with an Indianhead test pattern, you can look at the resolution wedge to see if the ringing frequency is the same as the chroma trap frequency.

[etype2]

Nice color bars.

[kvflyer]

Originally Posted by etype2

Nice color bars.

My thoughts, exactly!

[Electronic M]

Originally Posted by kvflyer

My thoughts, exactly!

+1

Despite the ringing that is very good picture quality for a 66 year old color TV. I'd probably decalre victory right there in your shoes.

[old_tv_nut]

The overall color looks great!

I do wonder if a re-tweak of the chroma bandpass alignment might make the transitions crisper, particularly, less of the blue phase distortion between the green and magenta bars. But, the IF alignment could get into the act here too, so it's a can of worms that might be better left closed. The effects are not obvious at all on the live video, which looks very good.

[trinescope]

I have begun the process of stripping the old finish off the cabinet. The only real challenge is going to be the fake burl sections on the front doors. The finish is alligatored, and there is too much damage for these to be saved. The only options I can think of are using vinyl decals or installing actual veneer. Unfortunately I'm not so free at the moment to just walk into a woodworking store and have a look around. Any opinions on what would be best here?

As far as the electronics, I messed with the convergence adjustments again and got a bit better result overall. About the only thing left is cleaning the tuner so it stops acting intermittent. Everything else seems to be remaining stable. This set would never make a useful daily driver anyway (nor would I expect it to be) since the picture is dim and small compared to pretty much everything that came after, so as long as it looks and operates half decent I will be happy with it as it is.

[etype2]

My cabinet has real burl-wood. https://visions4netjournal.com/wp-co...B0997BE00.jpeg

If it was me, I’d stay away from decals. Nice image. May I ask the source? I’d like to try the image on my Westy.

Very good progress on your Westinghouse.

[dtvmcdonald]

Originally Posted by etype2

My cabinet has real burl-wood. https://visions4netjournal.com/wp-co...B0997BE00.jpeg

If it was me, I’d stay away from decals. Nice image. May I ask the source? I’d like to try the image on my Westy.

Very good progress on your Westinghouse.

you mean the wreath? Its attached. The lower right magenta ornament
is hard to get right.

http://www.videokarma.org/attachment...1&d=1587769878

[trinescope]

You beat me to it, the image was from this thread

http://www.videokarma.org/showthread.php?t=272376

My "burl" is definitely fake, I looked at it with a loupe and could see the halftone printing. I guess I'll go with real veneer if I can find some that is nice and flat.

[etype2]

Oh, you mean that you added the photo to a homemade video, played it on your set and took a screenshot? I can do that. I was thinking an actual video source.

[trinescope]

Yes, I first took that image and added some areas on the sides to make it 640x480 then saved it to a USB drive. Then I used my digital converter box to display a still picture from that file. It's also how I do test patterns these days.