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ECF804

Sensibly equivalent to:
18D3 CV5948
    
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The ECF804 is a triode pentode designed for application in wide-band amplifiers and instrumentation. Wide band amplifiers require a large mutual conductance, and thus initial high gain, to allow feedback to broaden the bandwidth and flatten the pass-band, all at the expense of gain.
Looking directly into the gap in the anode along the grid axis a bright plate can be seen. Thus this is a beam tetrode rather than a true pentode.
The triode on the left is separated from the pentode section by a bright screening plate.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 48 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(t)
g1
g2
h
h
a(p)
k(p),s,g3
k(t)
g(t)

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.45
150
150
-2.0
7.0
2.2
0.35M
11.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 02, 2015.
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