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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.
Quite often Cossor valves are identified by V9 or V5 these are maker codes and not Type designations.
Our other 41MHL's are in balloon envelopes and one is metallised. See 41MHL for details of the inner structure.
The dome carries the Cossor name and the V9 code as well as BVA and Made in England. Inside can clearly be seen that two grids are present the inner grid with a finer winding pitch.
The top mica and grid supports.
The classic envelope is 49 mm in diameter, and excluding the B5 base pins is 113 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 March 18, 2019.
shape:classic construction:pinch type:triode age:1930.1940 base:b5 heater:4.0v pins:5 pin:1.a pin:2.g1 pin:3.h pin:4.h pin:5.k
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