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HL23DD

Sensibly equivalent to:
AR8 BVA132 CV1306 CV2995
    
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This battery double diode triode has a very low filament consumption. This suggests an oxide coated filament. It would have been used for detection, AGC detection and first audio amplification in radio receivers. Possible portable military equipment. The MO (Mazda Octal) base dates it as 1938 or after.
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 77 mm tall.
References: Datasheet, 1040 & 1043. Type HL23DD was first introduced in 1938.

 

Pin Connections
MO
1
2
3
4
5
6
7
8
tc
f(-)
-
a
-
a(d2)
m
a(d1)
f+
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
2.0
0.05
150
-2.8
1.5
24,000
1.05
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 20, 2013.
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