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.

 
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 datasheet

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This exhibit was last updated on 02 February 2008 {find valves by name}