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805

Sensibly equivalent to:
331A CV625
    
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The 805 transmitting triode is clearly designed for high voltage use, and at reasonable power levels. The graphite anode is 2-3 mm thick. The anode connection to the top cap is via a substantial tape. The base has four thick stub pins and a locating pip. This points to a bayonet base with spring connections. The valve seems to be a predecessor of the 813 (TT10) tetrode and is probably designed for output power levels of 250 Watts in the HF region of the spectrum.
See also 805.
The wide glass tube envelope is 60 mm in diameter and, excluding the base pins, is 187 mm tall.
References: Datasheet & 4061. Type 805 was first introduced in 1936.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
10.0
3.25
1,500
-16
210
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 15, 2013.
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