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6BA6

Sensibly equivalent to:
5749 CV454 EF93 PM04 W727
    
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The 6BA6 is a variable μ pentode for use at HF. Most probably as RF amplifiers in radio receivers. This version is branded Toshiba.
The company name Tokyo Shibaura Electric.
The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 47 mm long.
References: Data-sheet & 1040. Type 6BA6 was first introduced in 1950.

 

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
6.3
0.3
250
100
-1
11
4.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 16, 2021.
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