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Thompson V-50

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Post by ssg26k on Sat Feb 23, 2019 6:43 pm

I have a Thompson V-50 radio. I am looking for a schematic and operator /repair manual.
I also am wondering what is a component marked Glastor. Is this a fuse? If so where can I get a replacement.
Any help will be much appreciated. Thanks;
Steve

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Post by mr_ed01 on Mon Feb 25, 2019 12:35 pm

Glastor made resistors for early radios

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Post by Chas on Tue Feb 26, 2019 10:49 pm

The " Glastor" is the grid leak. Should be from 2 to 8 meg ohms.
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Post by ssg26k on Sun Mar 03, 2019 10:49 pm

Thanks for the information on the Glastor resister. Where can I find a replacement or modern equivalent? Thanks.
Steve

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Post by Chas on Mon Mar 04, 2019 11:13 am

Steve, There is no "snap-in" modern equivalent.
You can place a WTB wanted to buy in The Swap Meet for the grid leak. You can "jump out" the grid leak by using a 2.2 meg or so carbon resistor the watts do not matter. That will operate the set until a more appropriate value can be determined by trial and error. The limit for a grid leak detector is about 8.2 meg. ohms. Just twist the leads around the support clips.

Most grid leaks can be repaired by carefully removing the end caps, drilling tiny holes in the center of the caps, inserting the correct value resistor. Use a 1/10 watt, the diameter will fit into the glass tube. The body can be blackened with black lacquer paint to hide the modern color bands if need be... Forcing the metal cap off the leak in between the electrode leads of a Weller soldering gun will cause current to shunt through the metal cap, breaking the glue bond and expanding the cap. With pliers with smooth jaws, twist off the cap. If the glass breaks, common boro-silicate lab tubing can be used to replace the broken tube. Just be sure the bore will fit the replacement resistor.. No glue is needed if the resistor leads are soldered.

GL

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Post by ssg26k on Tue Mar 05, 2019 7:44 pm

Chas thank you for the tip.
Steve

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