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203THA

 
    
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The Cossor 203THA is a triode hexode mixer. The 203THA is electrically identical to the 4-THA apart from the 300 mA heater. Thus this mixer was designed for series heater chain receivers.
As well as the printed paper label the other side of the envelope has the type designation printed onto the external metallisation.
The classic envelope is 45 mm in diameter and, excluding the B7 base pins, is 110 mm tall.
References: 1043. Type 203THA was first introduced in 1938.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
a(t)
g1(t),g3
g2,g4
h
h
m,k
a
g1

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
20.0
0.3
250
100
-2
3.5
5.5
0.85

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
100
1.5
Updated December13, 2012.
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