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MH4

Sensibly equivalent to:
41MTL AC/HL AR17 CV399 CV1037 D4 HL4 MH4K NR31 VR37
See also:
Catkin Valves - The Metal Valve - Osram Catkin Advert - CV1037 short entry - CV399 short entry
    
Extras ▼

 

This MH4 catkin dows not have the K suffix to denote the external anode design but is identical to the designation MH4K.
The MH4 was designated as being for detector service in radio receivers. Catkin versions of the 1929 MH4 were introduced in 1933 and 1934.
The Osram identification label.
The top of the outer screen is capped with a plastic disc. The external anode lies just under this plastic disc.
The outer metal shroud is 32 mm in diameter, and excluding the B5 base pins is 97 mm tall.
References: Datasheet, 1005, 1043, 3002 & 1040. Type MH4 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
-4
5.0
11,100
3.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 05, 2015.
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