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ATTN:  Antique Radio enthusiasts, what is this part?? (HINT:  1936 Mills Jukebox)
ATTN:  Antique Radio enthusiasts, what is this part?? (HINT:  1936 Mills Jukebox)
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Old 4th December 2017, 07:26 PM   #1
TankAudio is offline TankAudio
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Default ATTN: Antique Radio enthusiasts, what is this part?? (HINT: 1936 Mills Jukebox)

Hi Guys,

(see photos)
This is a ceramic puck with (3) solder contact points. Inside, it has a small winding of wire around what looks to be a paper or cloth insulator. The insulating material is wound around a flat metal core.

This part is found in a 1936 Mills "Do Re Mi" amplifier. I've replaced all the resistors and capacitors, and this is the last part to confirm working before I can test the amp.

*Other notes: I noticed that some of the windings may have fallen off the paper material and now sit directly on the flat metal core. I would like to first know something about this part. Most importantly, I need to know what it does and whether I should attempt to fix the windings - moving them all back onto the insulator.

Precision resistor? Small value capacitor?? Thanks.
Attached Images
File Type: jpg 20171203_205101_Film1.jpg (80.7 KB, 106 views)
File Type: jpg 20171203_205116_Film1.jpg (82.5 KB, 104 views)
File Type: jpg 20171203_205146_Film1.jpg (83.9 KB, 104 views)
File Type: jpg 20171203_205217_Film1.jpg (54.6 KB, 103 views)
File Type: jpg 20171203_205234_Film1.jpg (53.7 KB, 102 views)
File Type: jpg 20171203_205325_Film1.jpg (88.4 KB, 42 views)

Last edited by TankAudio; 4th December 2017 at 07:27 PM. Reason: a word was mispelled
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Old 4th December 2017, 07:28 PM   #2
TankAudio is offline TankAudio
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photos attached.
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File Type: jpg 20171203_205101_Film1.jpg (80.7 KB, 37 views)
File Type: jpg 20171203_205116_Film1.jpg (82.5 KB, 15 views)
File Type: jpg 20171203_205146_Film1.jpg (83.9 KB, 12 views)
File Type: jpg 20171203_205217_Film1.jpg (54.6 KB, 13 views)
File Type: jpg 20171203_205234_Film1.jpg (53.7 KB, 14 views)
File Type: jpg 20171203_205325_Film1.jpg (88.4 KB, 18 views)
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Old 4th December 2017, 08:43 PM   #3
Elvee is offline Elvee  Belgium
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Looks very much like a thermal circuit-breaker. Pretty easy to test
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Old 4th December 2017, 09:24 PM   #4
simon7000 is offline simon7000  United States
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Is it paper or asbestos?
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Old 4th December 2017, 10:24 PM   #5
kaputt is offline kaputt  Germany
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It seems to be a switch. Can you check if there is continuity from the rivet that connects to the metal strip to one of the other two contacts?
If it was a thermal switch than both ends of the coil need to be in circuit for it to heat up.
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Old 5th December 2017, 06:54 PM   #6
thimios is offline thimios  Greece
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Quote:
Originally Posted by kaputt View Post
It seems to be a switch. Can you check if there is continuity from the rivet that connects to the metal strip to one of the other two contacts?
If it was a thermal switch than both ends of the coil need to be in circuit for it to heat up.
Many years ago this used as flip-flop switch for christmas lights.
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Old 5th December 2017, 07:29 PM   #7
simon7000 is offline simon7000  United States
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That could well be it. It would flash the lights on the juke box. Quite possibly not connected to anything audio.
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Old 7th December 2017, 08:40 PM   #8
TankAudio is offline TankAudio
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So it is fair to say that this switch is good if the wire has continuity? What are your thoughts on the apparent insulating material, is it truly there to provide functional insulation? I'm not sure whether it is paper or asbestos.

This thing has an adjustable contact point. If it were a switch, that would mean that the flat metal core should change shape and interrupt the flow of current in the event that the circuit parameters became harmful, right? What are your thoughts on the few windings that are in contact with the flat core? Thanks,
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Old 7th December 2017, 10:13 PM   #9
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by TankAudio View Post
What are your thoughts on the apparent insulating material, is it truly there to provide functional insulation? I'm not sure whether it is paper or asbestos.
It needs to be insulating, otherwise it will short the turns; it is probably a mica composite foil


Quote:
This thing has an adjustable contact point. If it were a switch, that would mean that the flat metal core should change shape and interrupt the flow of current in the event that the circuit parameters became harmful, right?
Yes, it is certainly a bimetal strip.
Quote:
What are your thoughts on the few windings that are in contact with the flat core? Thanks,
The start or the end is probably already connected to the core, but for the rest it certainly needs to be insulated
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Old 7th December 2017, 11:50 PM   #10
TankAudio is offline TankAudio
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Wow, thanks for all your help. I am actually surprised at the amount of support given to a part of such antiquity.
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