1958 Zenith 21" B&W console TV - vaccum tubes baby!

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Jon
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1958 Zenith 21" B&W console TV - vaccum tubes baby!

So I saw a post by a local guy giving away an old TV for free. He was told it worked the last time it had been powered up about 20 years ago. I got it yesterday, plugged it in and twiddled the knobs for a bit to get this showing (300K JPEG) on the tube. It looks ok, but it seems that the intelace isn't working. THe bright bar at the bottom of the imageis a squshed version of the above, leading me to thing that the set isn't sweeping back to draw the interlaced image. Anyone know if a 1958 set would do interlacing, or know more about tube/valve electronics to diagnose it? Other than that the set tunes to the local stations fine and the sound is almost perfect. I wouldn't expect tube generated sound through an 8-10" speaker to be nearly as tinny as the modern sets I have with pairs of 3" speakers. That one big speaker has great bass.

The TV is a Zenith C2358W w/ chassis 18C20 ca. 1958.

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I'm guessing the problem has

I'm guessing the problem has something to do with a bad vacuum tube. Those original TVs needed constant repair, mostly because of dead vacuum tubes. (Whenever you see a TV show or movie set in the 1950s, and there's a repairman there, what kind of repairman is it? That's right -- a TV repairman.)

I dunno how worthwhile getting that thing up and running will be -- but it would be great as the basis for any number of hacks.

Jon
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Replacement tubes seem to go

Replacement tubes seem to go for $1-10, so when I find a repair shop or local radio enthu. w/ a tube tester I'll have to get them checked out. I've got plans to see if a local industrial rock band would want to use it as part of their stage show. It'd be pretty cool to have the old set showing video instead of just using a projector onto a 3' screen like alot of industrial groups.

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Capacitors

The old capacitors from the 50s-60s weren't well made, and they tended to go leaky. Most of them are well and truly leaky by now Blum 3 Look for suspect caps, they're often made of wax paper from what I'm told. I seem to recall there being quite a few websites about identifying them.

You may also want to check repairfaq.org

Jon
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I managed to get the interlac

I managed to get the interlace working, but the video still isn't great. I just took out a few vaccum tube and reseted them and wiped the dust off a few. I'll take the time to clean each one and reinsert them to be sure I'm getting a good connection. Then, if it's still wonky, it's off to find a local with a tube tester... And I've got some really great contacts in the local radio community that know who to talk to. Smile

Oh, and audio wise, that 10" is a sub. It's got a pair of tweeters that I didn't think were speakers be cause they were hiding behind a couple cover plates. And it still sounds great.

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I'm doing a hack on a similar chassis

My fiancee has an old 19" Westinghouse tv that was gutted when she got it. I managed to mount a 17" crt monitor into it, and am creating a video player with a g3 in it.

iantm

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