The 210RC from Cossor is a high impedance triode for the detector stage of broadcast receivers..

The bright anode is broad and tall but only about 5 mm from front to back.

The filament is a single inverted V hairpin. The grid extends below the anode which has ridges pressed into the broad face to make it rigid.

The balloon envelope is 41 mm in diameter, and excluding the B4 base pins is 83 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	μ
	2.0	0.1	150	-1.5	0.85	50,000	0.7	35

This exhibit was last updated on 24 August 2008