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805

Sensibly equivalent to:
331A CV625
    
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The 805 is an HF transmitting triode rated for use up to 30 MHz.
The operating conditions are for Class C service. The control grid current is up to 40 mA.
The anode is milled (expensively) from a graphite block. One advantage is that this can be baked at a very high temperature during manufacture in order to expel contaminants and occluded gases. We believe it to be a direct ancestor of the 813 (also TT10).
The short stub pins may have been designed to fit into a bayonet fitting with spring clips to make contact with the pins.
The wide glass tube envelope is 55 mm in diameter and excluding base pins it is 194 mm tall.
References: Datasheet & 4061. Type 805 was first introduced in 1936.

 

Pin Connections
1
2
3
4
tc
f
ic
3
g1
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
Pdriv
Pdiss
Pout
μ
10.0
3.75
1500
-105
200
8.5W
125W
215W
50
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 14, 2013.
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