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DH149

Sensibly equivalent to:
7C6 CV887
    
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The DH149 is a double diode triode, and no specific design use is quoted. Normally such a valve would be used as signal and AGC detector plus first audio amplifier stage in broadcast receivers. This valve is unusual in that the anode impedance is high, maybe this valve was to be used for video demodulation and amplification.
The 7C6 is an equivalent but the pin connections are slightly different in that pin4 is acknowledged to be a cathode connection.
The wide glass tube envelope is 28 mm in diameter and, excluding the B8B base pins, is 54 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a
g1
ic
a(d2)
a(d1)
k,s
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.15
250
-1
1.3
0.1M
1.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 21, 2014.
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