Just received one of dad's first speaker drivers.
Anyone guess/know:
Make:
Model:
Year:
Value:
How it works:
Just received one of dad's first speaker drivers.
Anyone guess/know:
Make:
Model:
Year:
Value:
How it works:
Field coil driver
other than that don't know
When faced with another JBL find, Good mech986 says , JBL Fan mech986 says
The speaker is an armature speaker, which pre-dates the field coil type. Armature speakers were used in the first table top radios manufactured in the early 20th century. By the holes, the basket resembles the type Philips and Siemens used, but the speaker could have been manufactured anywhere around the globe. The basket with one respect resembles the early ALTEC Lansing baskets, which used a ring on the front to capture the cone surround.
The way it works is by means of an actuating rod in the magnetic field attached to the cone center. Very much in the same manner a solenoid operates.
Examples of armature speakers:
https://s-media-cache-ak0.pinimg.com...3928cb9559.jpg
http://www.crystalradio.net/misc/rca4t.jp
Ding! Ding! That was quick!
Here is the backside with the manufacturer name or location <?>.
(do I dare hook it up? ... 30hz test tone??, lol)
Hook it up to what? An amplifier? I would suggest consulting someone most familiar with such a device before firing it up. I certainly would not subject that speaker to 30Hz.
I'm going to take a wild guess. Is the surround made of leather? Utah was one of the first large scale loud speaker manufacturers in the U.S. The company was in direct competition with Lansing Manufacturing Company for radio speakers.
I suppose it could be leather. Very very worn leather. It is super soft to the touch and very pliable; at this stage, it feels more like velour.
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