L2 @ The Valve Museum

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L2

Sensibly equivalent^¶ to:

210LF AR9 CV1307 CV3531 L21 VR21 VR22

Extras ▼

Mazda HMS Collingwood Other L2 exhibits

The L2 is a low power audio amplifier triode. The filament is probably oxide coated to achieve such a low heating power.

The top of the envelope has the identification details. These include the words P.O. Research Station.

Taken from the side of the envelope, the date stamp can be seen as May 1934.

The balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 88 mm tall.

References: Datasheet & ¹⁰⁴⁰. Type L2 was first introduced in 1931.

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	-3.8	4.0	12,500	1.5

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 19, 2013.

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