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AC2/HL

Sensibly equivalent to:
41MHL 41MH 904V A30B CV2806 HLA1 HLA2 MH41 MH4 NH41
    
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The AC2/HL screened triode was introduced by Mazda in 1932.
As the metalising has fallen off in places it has been possible to photograph the internal structure. Apart from the clearly visible indirectly heated flat cathode, the fine control grid is just seen. The glass pinch is labelled AC2/HLJ.
The metalised balloon envelope is 43 mm in diameter and, excluding the B5 base pins, is 90 mm tall.
References: Datasheet, 1043, 3002 & 1040. Type AC2/HL was first introduced in 1931.

 

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
250
-1.2
2.5
11,500
6.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 07, 2013.
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