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6BA7

Sensibly equivalent to:
CV2527
    
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The 6BA7 is a heptode mixer known in the USA as a Pentagrid converter. The attached data-sheet dates from 1948 and gives initial characteristics.
The RCA branding. The screen can be seen below the bottom mica disc.
Through the side of the anode can be seen the many wires of the internal grids.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 58 mm tall.
Reference: Datasheet.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g2,g4
g1
k
h
h
g5,s
g3
s
a

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
6.3
0.3
250
100
-1.0
3.8
10.0
1M
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 17, 2019.
shape:thin.glass.tube construction:all.glass type:heptode age:1940.1950 base:b9a heater:6.3v pins:9 pin:1.g2.g4 pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.g5.s pin:7.g3 pin:8.s pin:9.a
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