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ID = 30794
Brand: Amalgamated Wireless (Australasia) Ltd. (AWA); Sydney
Developer: Amalgamated Wireless (Australasia) Ltd. (AWA); Sydney 
Tube type:  Gas Triode   Detector 
Identical to Expanse-B
First Source (s)
1920 : Saga of the Vacuum Tube, Tyne p.271,272

Base Wires
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / Direct / Battery =
Description Made by AWA Ltd.(Amalgamated Wireless Australasia Limited, 97 Clarence Street, Sydney), this soft tube had no contacting socket but wire leads. It used double filament. Production continued from 1920 to about the end of 1923. Early versions of the valve had ebonite caps 15 mm diameter. Later valves had bakelite caps with a diameter if 13 mm. It is not known when this change took place. Each valve had a serial number stamped on the anode and the highest serial number found so far is just over 10000. There is no information available to show exactly how many were made. Tube boxes located show that the tubes were packed in "raw" wool. 
Dimensions (WHD)
incl. pins / tip
x 90 x 25 mm / x 3.54 x 0.98 inch
Weight 25 g / 0.88 oz
Tube prices 1 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   Pages 273-275 and 467
70 Years of Radiotubes and V.   Page 187
Expanse-B: eigene Sammlung
Gerhard Eisenbarth

More ...
Expanse-B: Manufacturers info
Gary Cowans

Usage in Models 1= 1920?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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