An old, tube color TV

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Re: An old, tube color TV

Post by Guest on Sun Oct 26, 2014 8:51 pm

A balun is a devise to transition cabling, in this coax to 300 ohm on the antenna

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Re: An old, tube color TV

Post by Wildcat445 on Sun Oct 26, 2014 9:12 pm

Thanks, MR MEZ. Why didn't he just say so? That is like "plinth" the record player guys talk about. Ain't that just the motor board? Geez. Rolling Eyes

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Re: An old, tube color TV

Post by Guest on Sun Oct 26, 2014 9:38 pm

Why didn't he just say so?

I agree, the term balun is used with telephone and computer cabling which is why I know what it is. I've only heard it one other time when referring to a coax to 300 ohm adapter.

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Re: An old, tube color TV

Post by 75X11 on Sun Oct 26, 2014 9:45 pm

Sure that's what it was?
http://en.wikipedia.org/wiki/Balut_%28food%29
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Re: An old, tube color TV

Post by 35Z5 on Sun Oct 26, 2014 10:38 pm

MEZLAW wrote:A balun is a devise to transition cabling, in this coax to 300 ohm on the antenna

Except the one mentioned is inside the set, converts 300 ohm input to a lower impedance that feeds signal into TV tuner(its part of tuner)... Fairly common to find them open in older tube sets due to lightning, same would usually outright kill a SS set...
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Re: An old, tube color TV

Post by Wildcat445 on Sun Oct 26, 2014 10:46 pm

Thanks, Tom. I'm learning. Slowly. Now I know how radio newbies feel.

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Re: An old, tube color TV

Post by Guest on Sun Oct 26, 2014 10:52 pm

I didn't know they were inside the sets as well.

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Re: An old, tube color TV

Post by 35Z5 on Mon Oct 27, 2014 12:01 pm

Tuner balun...

300 ohm twin lead connects to posts and signal is passed to the small coil network at it's base... 'ceptin' for lightning or getting broken through mishandling, rarely gave a problem...

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Re: An old, tube color TV

Post by Wildcat445 on Mon Oct 27, 2014 11:53 pm

I found this Zenith roundie color console. No cataract, but it appears to have a CRT brightener on it? Probably all-tube, or is it new enough to be a hybrid?

http://racine.craigslist.org/atq/4669249940.html

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Re: An old, tube color TV

Post by 35Z5 on Tue Oct 28, 2014 1:29 am

Roundies were history before the hybrid sets hit the market... For most mfgr Last roundies were '67 models, a few sold them as late as '68, maybe '69...

Yes it has a brightener, definatly need a jug for that one...
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Re: An old, tube color TV

Post by Wildcat445 on Tue Oct 28, 2014 12:07 pm

The CRT has an RCA sticker on it. A replacement that needs replaced? Kinda unusual for a combination to have that many hours on it. I have heard that brigheners were sometimes used semi-unnecessarily, and that the tube can still be good without the brightener. That unit would work in a pinch in place of the elusive Magnavox.

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Re: An old, tube color TV

Post by 75X11 on Tue Oct 28, 2014 12:35 pm

Bear in mind the unit has been in operation nearly 50 years. The original could've lasted 25 years. Not to be argumentative, just points to consider. Things don't seem to have the age they actually do for us.
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Re: An old, tube color TV

Post by Wildcat445 on Tue Oct 28, 2014 2:25 pm

Yes, I reckon this is not 1975 anymore. I think a free-standing TV console is gonna work better than a combination. The wife is not enthusiastic about a combo. She is down for a console TV, so maybe that will be better. Finding a tube Magnavox color console is not gonna be easy. It may prove more elusive than a Concert Grand. We have three SS RCA consoles currently in use, so she can come up with a spot for another one.

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Re: An old, tube color TV

Post by 75X11 on Tue Oct 28, 2014 3:01 pm

They had a zenith of about 1966-67 vintage on CL here. It was a full stereo console in danish modern with a working TV. It lasted 2 days at $150.
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Re: An old, tube color TV

Post by Wildcat445 on Tue Oct 28, 2014 3:57 pm

I have rejuvenated my "network" that I had in place to hunt for a Concert Grand. If a Magnavox color TV still exists, I'll find it.

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Re: An old, tube color TV

Post by 75X11 on Tue Oct 28, 2014 4:29 pm

be vewy vewy quiet. I'm hunting coronadromes! Very Happy
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Re: An old, tube color TV

Post by 35Z5 on Tue Oct 28, 2014 8:26 pm

Wildcat445 wrote:The CRT has an RCA sticker on it.  A replacement that needs replaced?  Kinda unusual for a combination to have that many hours on it.  I have heard that brigheners were sometimes used semi-unnecessarily, and that the tube can still be good without the brightener.  That unit would work in a pinch in place of the elusive Magnavox.

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When the 1st wife & I set up house keeping in late '70 I had three '63-'64 roundies, all had tired/shorting CRTs, seven years was about average... Assuming 1965 and regular use, that Zenith should be on about it's 7th or 8th replacement... The smaller neck, rectangular 25AP22, etc usually lasted approx four years...

In later years tube life was far better, I have two 1986 Sears sets mfg'd by Sanyo that still have orig tube and are fine...
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Re: An old, tube color TV

Post by Wildcat445 on Tue Oct 28, 2014 9:25 pm

Is this chassis all tube or hybrid? I need to watch out for hybrid chassis. I want all-tube, even if most of them are Compactrons. I don't want one of those four-tube jobs that Zenith built. I can see about 10 or 12 tubes here, and some are Compactrons.

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Re: An old, tube color TV

Post by 35Z5 on Tue Oct 28, 2014 10:36 pm

Guessing you missed my post from last night?? AFAIK no 21" console roundie was ever built as a hybrid...

For the most part a hybrid console would have been introduced around 1970 and probably have a 25VxxP22 CRT(25VAMP22 was a common number)... Those 25V are the true 25" tubes that have a 315 sq in viewing area... The earlier 25"(25AP22, 25XP22 etc) are actually only 23" and 295 sq in view area... Sometime around '70 the FTC forced the industry to number tubes with the diagonal measurement of actual viewing area, not the corner to corner measurement of the glass... New types with 295 sq in viewing area were numbered 23VxxP22(and could replace the early 25" tubes I mentioned)...

BTW Zenith was somewhat buddy-buddy with GE for their tubes, thus there were a large number of Compactrons in their sets... On the other hand RCA wouldn't touch a Compactron, don't ever remember seeing one of their sets use one...
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Re: An old, tube color TV

Post by Wildcat445 on Wed Oct 29, 2014 11:33 am

Part of the confusion is that I failed to provide a link necessary to make sense. I understand no roundies were hybrid, but the one I was talking about (with no picture) was a rectangular tube, allegedly with no vertical sweep. There was a four-tube Zenith hybrid on another forum that I am not impressed with. I have been looking at several sets and making comments on them is getting convoluted. Sorry, Tom. I appreciate your input on this stuff. I'm like a kid in a candy store, I guess.

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Re: An old, tube color TV

Post by neali on Wed Oct 29, 2014 1:04 pm

Wildcat445 wrote:This one is closer to what I had in mind.

http://www.ebay.com/itm/vintage-1967-zenith-color-tv-/141446782441?pt=LH_DefaultDomain_0&hash=item20eee29de9

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That looks pretty nice and if has a horizontal line, that would mean the high voltage section is good. I would ask the seller. Very clean set.

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Re: An old, tube color TV

Post by Guest on Wed Oct 29, 2014 2:37 pm

That looks pretty nice and if has a horizontal line, that would mean the high voltage section is good

The few times I worked on TV's and had that problem it was a high wattage wire wound resistor that needed to be replaced.

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Re: An old, tube color TV

Post by Wildcat445 on Fri Oct 31, 2014 1:31 am

This thing is 10 minutes from here. Is this thing all solid state? It looks too new to have a tube TV.

http://phoenix.craigslist.org/evl/atq/4721038960.html

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Re: An old, tube color TV

Post by 35Z5 on Fri Oct 31, 2014 7:23 am

That has the 25V tube, probably hybrid or SS...
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Re: An old, tube color TV

Post by 75X11 on Sun Nov 02, 2014 1:22 pm

Here is one going up here.  It shows the innards so you can at least see what you would find inside, whatever kind it is.

http://atlanta.craigslist.org/nat/atq/4742743634.html
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