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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. This exhibit carries the alternate designation of 6CF6. Internally the glass seems to be coated - probably to avoid electron bombardment of the glass releasing gas molecules.
The etched Type designation on the envelope and the printed RCA logo below. Note the shield covering the anode lead.
The beam plates can be seen to pressed from a single sheet and within the electron stream are just two vertical strips on each side of the cathode.
The envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
Reference: Data-sheet. 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 July 04, 2021.
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