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Manufactured by Elkon, Inc. a division of P.R. Mallory. It was stated in early periodicals that only 200,000 would be made.
This "tube" is actually constructed from alternating layers of discs made from cupric sulfide and aluminum-magnesium. Technically called a "contact rectifier".
Direct from the literature contained in the tube canister:
"This rectifier is constructed to operate as a replacement unit in 'B' eliminators or a.c. sets apparatus using a 280 or 380 type rectifier tube.
The Elkon E80 is solid, sturdy, self-healing, will not burn out and is guaranteed for 5000 hours, or one year.
Electrically it has practically the same characteristics as the Standard 280 or 380 tube and will function in the same way.
The E80 is constructed to plug into a flat socket or receptacle, and where deep sockets or bayonet sockets are used, it will be necessary to use an adapter, which may remain in the socket permanently. There are a number of these adapters in the market.
When first operating the E80 Rectifier, or after it had been idle for some time, it requires from 15 to 30 seconds for it to become ready. However the fluctuations are so slight that it will not interfere with reception.
Under normal operation, the temperature of the metal casing will rise to a temperature of approximately 60°C, or 140°F. While this temperature may seem dangerously hot to the touch, it is well within safe limits, and, as a matter of fact, does not exceed the temperature of the glass of other similar types of rectifiers. Due to the greater heat conductivity of the metal casing it will be a great deal hotter to the touch than the glass bulb of the same temperature.
The rectifier is sold for the purpose of operating 'B' eliminator, and a.c. sets and our guarantee will not cover any experimental use of the rectifier.
If the rectifier is taken apart, or in any way tampered with, we cannot be responsible for the performance thereafter, and our guarantee is voided. "
See articles in Citizens Callbook Nov 1928 page 105, and Radio Engineering Magazine June 1928 page 35. The technology was developed by Dr. H. Shoemaker of Elkon Works, NYC.
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