I'm working on a 37-610 in a Tombstone style cabinet. I finished all but two capacitors, I have to order more.
I started looking over tuning and it stopped about half-way. I look in the back and the variable capacitor is in the right place but then I noticed this little half-gear has reached its end stop. It shouldn't be stopping right there. The shaft has serrations that hold this gear in place. It's a double gear made from two then pieces of metal and there's some springs that hold them together.
So what goes here? It must have been this way for sometime. Considering the shaft condition it looks like should have never happened. It was stiff, maybe someone tried to force it at one point and it skipped.
How do you properly realign this gear?
The two gears w/a spring in between is called an anti backlash gear. It's designed to take up any slack between it and the gear that is driving it. In other words there is no free play.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
It doesn't look like there is any way to change the relationship between the split gear and the tuning capacitor's shaft. It's pressed on. As long as it hasn't broken away or the teeth are stripped off your ok. The planetary drive can be replaced separately and probably isn't a bad idea to disassemble and clean it . They get gummed up stiff.
Here's a couple of pic of the relationship of the split gear vs tc plates from a 37-620.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
(This post was last modified: 04-03-2022, 01:15 PM by Radioroslyn.)
A funny thing. I finished replacing caps, put a new 3-prong cord on it, oiled the tuning and put it all back together and the problem went away. It apparently didn't like laying on its side on the workbench - now in the upright with all the screws back in it's working great, all three bands, comes in like gangbusters -- best patient I even had.
I'm going to fix the pencil hole in the speaker, put it back in cabinet and send it on its way.
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