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MHL4

Sensibly equivalent to:
154V 164V 41MLF CV1038 CV3547 NR26 VR38
See also:
CV1038 short entry
    
Extras ▼

 

The MHL4 was used in professional and military applications over many years until it was superseded by the L63, which had comparable characteristics.
The electrodes: the mesh anode and getter support at the top. The cathode is connected at the opposite end to the heater making a long path.
The mesh annular getter holder.
Another view of the electrodes. The support is only from the glass pinch.
The balloon envelope is 50 mm in diameter and, excluding the B5 base pins, is 114 mm tall.
References: Datasheet, 1040 & 1043. Type MHL4 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
250
-8
8.0
8,000
2.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 03, 2015.
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