The 41MH triode dates from 1931. The valve has external metalising and this screening indicates an RF use.

See also 41MH for a classic envelope version.

The balloon envelope is 48 mm in diameter and, excluding the B5 base pins, is 102 mm tall.

 
Pin Connections

B5	1	2	3	4	5
	a	g1	h	h	k,

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	1.0	200	-1.5	3.2	18,000	4.0

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 13 December 2008