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 Post subject: HELP! 1950 Motorola Console TV
PostPosted: Feb Mon 19, 2018 12:28 am 
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Joined: Jan Mon 12, 2015 5:58 pm
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The Connector broke off the back of the tube. the glass doesn't appear broken. Are these things repairable?


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Mon 19, 2018 1:59 am 
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Joined: May Sun 07, 2017 11:35 am
Posts: 281
Generally, but you need to be able to identify the wires.

Have a look at this for starters....

viewtopic.php?f=3&t=328851&start=60


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Mon 19, 2018 5:14 pm 
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Location: Chicago, IL USA
Identifying the pins should be easy. Every early B&W CRT uses the same 5 pins in the same order.

Here's a thread I made a while back on the subject. Back then I attached extension wires to aid in threading on the new base.
http://www.videokarma.org/showthread.php?t=248393

Since then, I've found it easier to very carefully adjust the 5 wires so they are all lined up with the base and slide it on without the extension.

Make sure that each wire is going all the way down the hollow base pin. Then I solder each pin and run a bead of Permatext flowable silicone adhesive around the base to hold it on.

https://www.walmart.com/ip/Permatex-817 ... 3=&veh=sem


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Mon 19, 2018 11:36 pm 
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Joined: May Sun 07, 2017 11:35 am
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That's good advice.

To make sure you have the right wires try using the CRT tester I detailed in a recent post.

viewtopic.php?f=3&t=331576

Use clip leads to connect to the wires.
This will allow you to correctly and safely identify the heater wires and, more importantly, check that your trouble will be worthwhile, which it won't be it the tube is bad.
The heater wires connect to the pins either side of the key on the base spigot. The other wires fan out either side of the heater wires in the same order.
Be careful, those wires are somewhat brittle and if one of them breaks off at the glass seal you are stuffed!


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Tue 20, 2018 2:07 pm 
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Joined: Jan Mon 12, 2015 5:58 pm
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Thanks for all the great info. I'll have a look at it this weekend. Sorry for delayed response, my subscription alerts were in my spam email. All fixed now


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Tue 20, 2018 3:06 pm 
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If using silicone to secure the base to the glass, don't be tempted to substitute an "ordinary" silicone sealer.
Most are acid cure and will rot the wires away within a few months.
Sniff it first! If what you have smells like vinegar, DON'T let it get anywhere near anything electrical!

I would use two-part epoxy or even contact adhesive. But the correct silicone is OK too.


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Tue 20, 2018 4:08 pm 
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Location: Chicago, IL USA
Yes, you must use sensor-safe silicone. The Permatex I mentioned works very well. It's also flows down into the void so you can apply it after you've attached the base and soldered the wires.

I don't advise using two-part epoxy. The neck gets quite warm during operation and will expand a little. You want your adhesive to have a some give. It's also what Hawkeye used back when they were rebuillding CRTs.

Also, if you do ever need to get the base off again silicone is easier to undo than epoxy.


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Thu 22, 2018 4:09 pm 
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i remember using gc service cement to glue tube top caps back on. it worked very well. i would think this would also work for the connector on the crt but not positive.

i wonder what the factory that made the crt used to glue the connector on? does anyone know?


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Thu 22, 2018 4:49 pm 
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Location: Chicago, IL USA
It's based on a phenolic resin. The recipe RCA used can be found in this thread.

http://www.antiqueradios.com/forums/vie ... 9&t=259810


Coarse marble flour 170 lb.
Orange flake shellac 19 1/2 lb.
Durite phenolic resin LR275 27 1/2 lb.
Medium color (grade G) rosin 3 1/4 lb.
Denatured alcohol 9 liters
Malachite Green aniline dye 10 g.


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Thu 22, 2018 5:40 pm 
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Joined: Jan Mon 12, 2015 5:58 pm
Posts: 11
Hmmm what a recipe. Can I get all of that at Wal-Mart? Ha hahaha


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 Post subject: Re: HELP! 1950 Motorola Console TV
PostPosted: Feb Thu 22, 2018 10:13 pm 
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Posts: 281
That's why we suggest non-acid-cure silicone......

The recipe dates back to the 1920s.....


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