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12BA6

Sensibly equivalent to:
CV1928 HF93
    
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The 12BA6 is a variable μ pentode for use at HF within AC/DC receivers. Most probably as RF amplifiers. The 300 mA heater is clearly rated for series heater chain use.
The RCA brand lettering.
The anode obscures most of the inner details, here is a glimpse inside through the hole in the anode side wall.
The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 46 mm long.
References: Datasheet & 1040. Type 12BA6 was first introduced in 1946.

 

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
gm
12.6
0.15
250
100
-1
11
4.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 19, 2019.
shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 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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