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ECH3

Sensibly equivalent to:
CV2929
See also:
Mullard Red 'E' Series Advert, July 1939
    
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The ECH3 is a triode hexode mixer for broadcast receiver use. The base is the continental side contact type. The oscillator triode has to supply 11 Volts peak to peak for the hexode mixer for correct operation.
A year later in 1940 the ECH3 was also available with the IO base and called the ECH33.
Just red coloured zinc paint.
The classic envelope is 34 mm in diameter and, excluding the Ct8 base pins, is 89 mm tall.
References: Data-sheet, 1040 & 1043. Type ECH3 was first introduced in 1939. See also 1939 adverts.

 

Pin Connections
Ct8
1
2
3
4
5
6
7
8
tc
m
h
h
k
a(t)
g1(7),g3
g2,g4
a
g1

 

Absolute Maximum Operating Conditions
Hexode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
250
100
-2
3.0
3.0
1.3M
0.65

 

Absolute Maximum Operating Conditions
Triode
Va
Vg
mAa
150
-
3.3
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 03, 2022.
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