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68506

Sensibly equivalent to:
18049 2000
See also:
Tungar Rectifiers - Ediswan Tungar Rectifier Box
    
Extras ▼

 

The 68506 is a Tungar half wave rectifier designed for low voltage battery chargers. Tungar comes from the Tungsten filament and the Argon gas filling. The anode is graphite. The gas makes possible a low voltage drop across the rectifier, typically 10 Volts, but also limites the anode voltage.
See also The general Electric Tungar booklet.
The Tungar name and the makers identification - Edison Swan.
The logo and etched lettering on the silvered glass.
The construction of this exhibit. Some Tungar rectifiers had a clear envelope but with this gettered design the internal structure is obscured. With a very strong backlight and a long exposure this image was formed.
The anode connection and ceramic insulators.
The balloon envelope is 81 mm in diameter, and including the GES base is 157 mm tall.
References: Datasheet. Type 68506 was first introduced in 1948.

 

Pin Connections
GES
1
2
tc
f
f
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
2.3
18.0
75
6,000
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 06, 2014.
shape:balloon construction:pinch type:rectifier.hw age:1940.1950 base:ges pin:1.f pin:2.f pin:tc.a
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