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OM10

Sensibly equivalent to:
6C31 CV1581 ECH33 ECH35 X147 X61M X65
    
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The OM10 is a triode hexode frequency changer for radio superhet receivers. The heater is both 6.3 Volts and 200 mA so is suitable for both parallel and series heater arrangements. The Mullard direct equivalent is the ECH33 and this is defined by its 200 mA heater requirement. However, the ECH35 is close.
The classic envelope is 32 mm in diameter, and excluding the IO base pins is 92 mm tall.
References: 1040 & 1043. Type OM10 was first introduced in 1940.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g2,g4
g1(t),g3
a(t)
h
k
g1

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
250
100
-2
2.7
3.8
0.6M
0.7

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
70
3.0
Updated January 05, 2014.
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