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6Zh8

Sensibly equivalent to:
6ж8
    
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The 6Zh8 is the english designation for this Soviet valve. In Cyrillic the Type is 6ж8.
It is a voltage amplifier HF pentode.
The reverse is plain paint. The top of the envelope is pinched-in, probably to hold the internal structure rigid.
The thin metal tube envelope is 25 mm in diameter, and excluding the IO base pins is 53 mm tall.
References: Russiantubes.com.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
-
h
g3
g1
k
g2
h
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
6.3
0.3
250
100
-3.0
4.0
2.0
Updated January 13, 2017.
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