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6H8

Sensibly equivalent to:
6H8MG
See also:
The 'Magic Three' Valves
    
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The 6H8 is a metal envelope doube diode triode and is another implementation of the final valve in the magic three series. The double diode triode acting in a superhet receiver as signal detection, AGC detection and first audio amplifier.
The Type designation is stamped into the envelope.
The top cap forms part of the vacuum seal.
The wide metal envelope is 31 mm in diameter, and excluding the IO base pins is 90 mm tall.
References: Datasheet & 3002. Type 6H8 was first introduced in 1939.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
M
h
a
a(d2)
a(d1)
g2
h
k,g3
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
125
-2
8.5
2.6
0.65M
2.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 14, 2013.
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