UBB Store

Antique Loose Coupler Radio Tuner Wm. J. Murdock Co. c1914
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Antique Loose Coupler Radio Tuner Wm. J. Murdock Co. c1914
Price: CA $270.59

Antique loose coupler manufactured by Wm. J. Murdock Co., c1914.

Note that the slider bar has two connections that would appear to be a short circuit, however the binding post nearest the secondary coil is actually insulated from the slider bar with fiber washers and has the end of the primary coil wire soldered to the screw head.This post serves as the antenna connection while the post on the opposite end of the slider bar is ground.

The vertical arrangement for the secondary coil guides is unusual. There are eyelets installed in each corner of the base to provide screw-marring protection when the unit is mounted to a table.

Also know as a \"Receiving Transformer\", loose couplers were used extensively in receivers built during the \"teens\", typically with a crystal detector.

As can be seen from the pictures, this unit is in excellent condition, which is quite remarkable consider that it is more than 100 years old.



Buy Now

Related Items