Cossor describe the 210LF in their 1935-6 manual as a valve primarily intended as the first low frequency (AF) stage.

The 210LF is recommended as being useful as the driver for a class B stage in combination with the Cossor 220B. See PM2B as similar.

Full output must not be expected from the class B valve when the 210LF is used as a driver, but the highest economy in anode current is obtained, combined with adequate volume for all domestic purposes.

The balloon envelope is 40 mm in diameter and, excluding the B4 base pins, is 84 mm tall.

 
Pin Connections

B4	1	2	3	4
	a	g1	f	f

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	2.0	0.1	150	-4.5	4.8	10,000	1.4

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 09 June 2007 {find valves by name}