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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. The use would be in radio receivers up to the HF bands. The direct equivalent is the ECH33.
The triode oscillator section has to generate an 11 volt peak to peak injection voltage. The anode of the OM10 is only 70 Volts, so while an ECH35 may be tried in place of the OM10 the reverse is not advised.
The classic envelope is 31 mm in diameter and, excluding the IO base pins, is 89 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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