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Old 24-10-21, 17:14
David Dunlop David Dunlop is offline
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Join Date: Feb 2006
Location: Winnipeg, MB
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Default RECEIVERS Anti-Strain

When RCA Canada developed the Headgear Assemblies, Cdn, Type 10 for the Wireless Set No. 52, they incorporated the pre-existing Receivers, Watch, MC 50-Ohm (ZA/CAN 0842), which had been used on some of the headgear made for the Wireless Set No. 19. They did so, however, with a couple of interesting changes.

They took advantage of the push in connection feature of these receivers, rather than using the terminal screws to mount into ring terminals on the leads. This may have solved a couple of related problems in the field. The screws no longer have to be completely removed to replace a defective Receivers Watch MC, so the screws are less likely to be lost. Additionally, placing the lead connections inside the Receivers, Watch MC gets them out of the way of excessive moisture/rain, which may have been causing difficulties.

The second change RCA made was in adopting the small metal S-Rings for the Anti-Strain devices on the Receivers, Watch MC. On the Wireless Set No. 19 headgear using the Receivers, Watch MC, a smaller metal crimp clip was used to secure the loom on the Cord up by the Receiver leads. Woven into the loom at these two ends was a length of what looks very much like a length of thin, brown or black, shoelace. When the Cord is fitted to the Receivers, this lace is looped through the Bakelite Anti-Strain loop cast into the side of the Receivers below the terminals and then woven around the leads to transfer the weight of the Cord off the terminal connections. The excess lace is then trimmed away leaving a telltale little stub about ½-inch long sticking out.

The first photo posted today shows the broken connection on the Type 10 Headgear I have to replace. The S-Ring is still in place on the receiver loop. The second photo is of a headgear assembly from a Wireless Set No. 19, using the same Receivers, Watch MC. You can clearly see the brown Anti-Strain lace woven around the connections. It is possible these cotton lace Anti-Strains were subject to rot, and subsequent failure, so RCA went with the metal S-Rings.

Also worth noting in the second photo is the massive amount of red lacquer used to cover the two terminal screws. Very little is evident in the first photo where the connections are now inside the Receivers, Watch MC.


David
Attached Thumbnails
RECEIVERS, Watch, MC Anti-Strain 1.JPG   RECEIVERS, Watch, MC Anti-Strain 2.JPG  
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