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6B8

Sensibly equivalent to:
CV1894 VT-93
See also:
Metal Striptease
    
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The 6B8 American metal valve is a double diode pentode. Such valves were made for the signal detector, AGC detector and first audio amplifier stages of superhet receivers usually as a double diode triode. This valve with a vari-μ pentode offered the set designer the option of using this as final IF stage plus detectors. For local reception a pentagrid converter (heptode), this valve and sensitive output valve may have been all that was required apart from a rectifier.
The 12C8 is electrically identical but has a 12 volt heater.
The thin metal tube envelope is 24 mm in diameter and, excluding the IO base pins, is 62 mm tall.
References: Datasheet, 1040 & 1043. Type 6B8 was first introduced in 1937.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
125
-3
10
2.3
0.6M
1.33
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 28, 2013.
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