Sensibly equivalent¶ to:
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.
Absolute Maximum Operating Conditions¶
Updated February 15, 2013. shape:wide.glass.tube construction:pinch type:triode age:1930.1940 base: pins:4 pin:1.f pin:2.ic pin:3.f pin:4.g1 pin:tc.a