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12BL6

 
    
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The 12BL6 is a vari-μ RF pentode for RF or IF stages of car radios. Typically the 12BL6 would be used with an HT of 12.6 Volts from the car supply.
These valves were used in hybrid receivers where the RF section was valve and the audio was transistor.
The notch in the anode reveals the three wire grids.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
Reference: Data-sheet. Type 12BL6 was first introduced in 1956.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
g3,s
h
h
a
g2
k

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
12.6
0.15
30
30
-0.65
20
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 08, 2020.
shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b7g heater:12.6v pins:7 pin:1.g1 pin:2.g3.s pin:3.h pin:4.h pin:5.a pin:6.g2 pin:7.k
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