The DET22 is a physically small disc seal triode valve, with co-axial connections. The heater and cathode are opposite the main envelope and the emitting surface is a flat topped thimble. The grid has a circular connection to the flat internal metal mesh. The anode is Copper and has a flat surface facing the grid and positioned very close to it.

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.

The planar envelope is 15 mm in diameter and, overall is 60 mm tall.

 
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}