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42-OT/DD

Sensibly equivalent to:
CV2512
See also:
Cossor Output Tetrodes Advert
    
Extras ▼

 

The Cossor 42-OT/DD is a double diode beam tetrode. The output is given as 3.1 Watts with a load impedance of 6,500 Ω and a cathode resistor of 130 Ω.
The B7 Base.
The pinch is visible but the internal coating blocks all other details.
The bottom flap of the box.
Thanks to Mark Mallison for sending the images.
The classic envelope is  mm in diameter and, excluding the B7 base pins, is  mm tall.
Reference: 1043. Type 42-OT/DD was first introduced in 1937.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
a(d2)
a
a(d1)
h
h
k
g2
g1

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
4.0
2.0
250
250
-5.5
34.0
7.0
7.0
Updated October 13, 2019.
shape:classic construction:pinch type:double.diode.beam.tetrode age:1930.1940 base:b7 heater:4.0v pins:7 pin:1.a(d2) pin:2.a pin:3.a(d1) pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.g1
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