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#1
11-18-2015, 03:56 PM
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1951 zenith 16" porthole
So I have a 1951 16" porthole with a 16gp4. I tested it on my bk cry tester and it looks completely dead. I attempted rejuvenating with it going up a little, then falling back to zero. Is something baking at a higher filament voltage would help, or is this tube gone?
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#3
11-18-2015, 07:23 PM
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The one in my 51' Zenith was STONE dead until baked at elevated heater voltage for a couple of hours....Then it slowly came to weak usable (with a brightener) life.
ALWAYS run the heater at mild over voltage for at least 15 minutes BEFORE you do or consider a rejuvination.....Else you risk burning the last of the cathode material off.....I hope you did not ruin your tube doing the rejuvination first. I say if they are only usable with a brightener, then it is a hell of a lot better than a stone dead tube.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#4
11-18-2015, 07:24 PM
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How much were you asking for it? I'd rather have a weak one over a dead one.
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#5
11-18-2015, 08:01 PM
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I would gladly take $50 for it....If you could somehow GET it. BTW....I did NOT "bake" mine long...just checked it on my 70...it showed weak...so I "gassed it " a bit--to about 7 volts or so and it came to the good area and HELD there. LIkely would work in a set. CERTAINLY it is NOT DEAD.
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#7
11-18-2015, 10:23 PM
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It would....but id have to have them shipped. I've also got an unusual 16" travler pudhbutton console tv with a completely shorted 16EP4.. I'm on the hunt for that guy without paying a fortune too..
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#8
11-18-2015, 10:38 PM
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Forget to put a picture on of the set....
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#9
11-18-2015, 10:40 PM
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Here it is with the doors open and the chassis out...trying to cook the CRT.
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#10
11-19-2015, 04:33 AM
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I *may* have one too. If it's the one I'm thinking of, the tube tests like new. Where you at, anyway?
__________________
"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
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#11
11-19-2015, 05:55 AM
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St. Louis, MO.
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#12
11-19-2015, 09:50 AM
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I think that's one of Zeniths better looking porthole designs. Unfortunate that yours is tipped on it's side.
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#13
11-19-2015, 10:24 AM
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Yeah sorry, I upload pictures from my iPhone and that's how they load. I replaced two bad 6sn7s and my 1b3 was bad. I hooked up to a variac and brought it up slowly. It did light up a little and had about 6-7000 volts on the second anode. Below is the image I got. Maybe after restoration and s brighter it will be good enough until I find a replacement. I'm going to finish my Bakelite Crosley first, then I'll move onto it...
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#15
11-19-2015, 06:20 PM
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Hold the phone sideways. Ever see videos when people take them with a phone and don't turn it sideways? You get a narrow long image. When rotated it will take a 16.9 image and it looks like that's the type of picture you are taking.
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