▼ Menu

L2

Sensibly equivalent to:
210LF AR9 CV1307 CV3531 L21 VR21 VR22
    
Extras ▼

 

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.
Return to Main Index