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6CB6A

Sensibly equivalent to:
6CF6 EF190
    
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The 6CB6A is a short cut-off high impedance voltage amplifier pentode.
The Clairtone logo is clearly seen but the electrodes are not. Fortunately the 6CB6 has the structure visible.
The envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
Reference: Datasheet. Type 6CB6A was first introduced in 1957.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
mAa
mAs
ra
gm
6.3
0.3
200
150
9.5
2.8
0.6M
6.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 28, 2013.
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