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20L1

 
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The 20L1 from Mazda is from the early days of all glass construction in the UK ie 1947-49. This is a low impedance amplifier double triode and could have found uses in a wide variety of equipment. The 12.6 Volt heater requirement makes this particularly suitable for vehicle use, likewise the 200 mA current rating makes it suitable for television use. The 6L1 is identical except for a 6.3 Volt heater.
The thin glass tube envelope is 19 mm in diameter and, excluding the B8A base pins, is 53 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a(2)
g1(2)
k(2)
a(1)
g1(1)
k(1)
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
12.6
0.2
250
-11.5
10.0
6,200
2.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 02, 2013.
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