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703A

 
    
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The 703A is a power triode for generating RF at up to the UHF region.
The filament runs vertically and is held under tension by a spring arm. The anode is finned and semi-circular at the apex of the triangular fins. The grid is helical and held to a vertical support opposite the open end of the anode.
A Japanese company (Yamamoto Sound Craft Corp) has, in 2012, offered new bases for these valves and suggested their use for audio. With an anode load of 5,000 Ω HT of 377 Volts, grid at -21.6 Volts setting a current of 37 mA an output of 1 Watt is claimed.
The balloon envelope, also known as a doorknob, is 50 mm in diameter and, including the special base pins, is 41 mm tall.
References: Datasheet.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
mAa
gm
μ
Pdiss
1.15
4.5
400
75
2.5
12
20W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December03, 2012.
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