The DET22 is a UHF disc seal triode. The heater and cathode are opposite the main envelope. The grid has a circular connection to the flat internal metal mesh. The anode appears to be copper and has a flat surface facing the grid.

A grounded grid configuration would allow for a two cavity mechanical design.

This valve is rated at 600 MHz but its extended maximum frequency of 4 GHz made it a natural choice for microwave designs.

Unlike other versions of this valve the Osram process gives a flat top and a smaller envelope length by 5 mm.

The planar envelope is 15 mm in diameter and 55 mm long.

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	mAa	Pout	Pdiss	freq	f.max
	6.3	0.4	350	40	3	10	600	4000

Thanks to Frank Philipse for supplying the above datasheet

More

This exhibit was last updated on 03 June 2007 {find valves by name}