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ECF80

Sensibly equivalent to:
6BL8 6C16 CV5215
See also:
Valves and their Habits - Valves for Bands III, IV & V
    
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This ECF80 from Mullard differs from ECF80 in having white lettering and the later logo.
Mullard say that the ECF80 was designed for operation up to 220 MHz. As 1950s television receivers tended to use the PCFnn 300 mA valves, the production of this valve with a 6.3 Volt heater suggests that it was aimed at the professional VHF communications market.
The triode is the oscillator and has to produce 5 V pk-pk signal. The screened pentode is the mixer. The valve has two cathodes so two independent valves are sited in the one envelope.
The triode on the left with grid visible through the hole in the end wall of the anode. he pentode is oriented at 90 degrees to the triode.
The pentode looking along the line plane of the grids. The suppressor grid support can be seen through the holes in the end of the anode.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.
References: Datasheet & 1040 Type ECF80 was first introduced in 1954.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.43
250
180
-5.8
5.7
1.4
1.5M
2.1

 

Absolute Maximum Operating Conditions
Triode
Va
Vg
mAa
ra
gm
100
-2
14
4K
5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 21, 2014.
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