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41MHL

Sensibly equivalent to:
354V A30D AC/HL CV2504 D4 HLA2 MH4
See also:
Cossor 41MHL Box
    
Extras ▼

 

The 41MHL is an indirectly heated triode and was suitable for detector or audio amplifier in a radio receiver. Internally the valve has both a control grid and a screen grid. The latter is internally connected to the anode by a length of coiled wire.
Our other 41MHL is metallised.
The anode consists of a box support with a mesh centre to each working face.
The insulated heater wires can be seen entering the oxide coated cathode. The anode connects internally to the screen grid.
The internal construction. The screen grid is connected internally to the anode. The control grid is wound on two notched rods but has been crimped so as to form the grid around the central cathode tube.
This image shows the grid formation.
The balloon envelope is 50 mm in diameter, and excluding the B5 base pins is 106 mm tall.
References: Datasheet, 1043, 3002 & 1040. Type 41MHL was first introduced in 1930.

 

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
4.0
11,500
4.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 07, 2013.
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