The 1626 was designed as an RF power oscillator in the 1930s. The operating conditions were to be class C and that explains the high negative grid bias. The valve was only designed to provide short pulses of power in the anode tuned circuit. The circuit itself would then ring and generate sine wave outputs.

Recently this triode design has been pressed into service within an audio amplifier design.

The classic envelope is 36 mm in diameter, and excluding the IO base pins, is 89 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	-	h	a	-	g1	-	h	k

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	Pdiss	Pout	μ
	12.6	0.5	250	-150	25	5W	4W	5

Thanks to Frank Philipse for supplying the above datasheet

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