The GL446A from GE is what the Americans call a lighthouse tube because of its appearance.

The cathode with its flat top is placed in close proximity to the wire mesh grid. The anode protrudes down the top glass cylinder and almost touches the grid. This follows the pattern of most high frequency planar triodes. So called because the operating area is all in the one plane and the electrodes have a very small physical separation.

Most of the european devices had co-axial connections unlike the conventional base used by General Electric. We have no operating frequency data. The 1951 data book has this listed but later editions do not.

The metal skirt of the envelope is 25 mm in diameter and, excluding the IO base pins, is 49 mm tall.

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	gm
	6.3	0.75	250	-1	25.0	7.0

This exhibit was last updated on 02 December 2007