The CV82 UHF triode from the 1930s uses disc seal construction but does not then make use of a mesh grid to divide the filament from the anode. The so called lighthouse layered valves came later.

The wide glass tube envelope is 27 mm in diameter and, excluding the base pins, is 70 mm tall. The copper grid disc is 48 mm in diameter.

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	mAa	Pdiss	Pout	freq	f.max
	4.0	0.7	350	28	6W	1.5W	750MHz	850MHz

This exhibit was last updated on 20 January 2003