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AC/HL

Sensibly equivalent to:
354V 41MHL A30D AR17 CV399 CV1037 CV2811 D4 HL4 MH4 MHL4 NR31 VR37
See also:
Shortpath Construction - 1929 Advert
    
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The Mazda AC/HL is an indirectly heated audio amplifier triode and the design dates to 1929. These valves were rugged and had long service lives. In the late 1920s and early 1930s Mazda produced the leading indirectly heated valves. The AC/Pen of 1930 set the standard that others followed.
From the top of the dome the rear wing of the anode can be seen.
The short path construction method is visible in this picture. The anode wings and the closely wound grid are defining features.
See also AC/HL
The balloon envelope is 56 mm in diameter and, excluding the B4 base pins, is 109 mm tall.
References: Datasheet, 1043, 3002 & 1040. Type AC/HL was first introduced in 1929.

 

Pin Connections
B5
1
2
3
4
5
a
g1
h
h
k

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
4.0
1.0
200
-3.5
5.0
12,500
2.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 07, 2013.
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