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.

 
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 datasheet

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This exhibit was last updated on 18 July 2007 {find valves by name}