37-610 Half gear in front of variable capacitor slipped?? - Printable Version
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+--- Thread: 37-610 Half gear in front of variable capacitor slipped?? (/showthread.php?tid=23419)
37-610 Half gear in front of variable capacitor slipped?? - Daniel Bingamon - 04-02-2022
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?
RE: 37-610 Half gear in front of variable capacitor slipped?? - Radioroslyn - 04-02-2022
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.
RE: 37-610 Half gear in front of variable capacitor slipped?? - Daniel Bingamon - 04-03-2022
I'm familiar with the concept, I couldn't remember the term.
Any ideas on how to reset it's position?
RE: 37-610 Half gear in front of variable capacitor slipped?? - Radioroslyn - 04-03-2022
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.
RE: 37-610 Half gear in front of variable capacitor slipped?? - Daniel Bingamon - 04-04-2022
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.
RE: 37-610 Half gear in front of variable capacitor slipped?? - Daniel Bingamon - 04-04-2022
Radioroslyn, thank you for the photos.
RE: 37-610 Half gear in front of variable capacitor slipped?? - radiorich - 04-04-2022
Hello Daniel Bingamon ,
wow that is one for the books as they used to say that is a first for me !
Glad you got it working .
Sincerely Richard