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ECF80

Sensibly equivalent to:
6BL8 6C16 CV5215
See also:
Valves and their Habits - Valves for Bands III, IV & V - ECF80 and ECF82
    
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Mullard say that the ECF80 was designed for operation as a frequency changer 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 envelope lettering is in yellow and this suggests a manufacture date of 1969-70 - the golden jubilee year of Mullard. The valve also carries the words Made in Canada.
Standard construction: bars to parallel the heaters, copper control grids supports and an electrostatic screen between triode and pentode.
The triode - face view.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 47 mm tall.
References: Data-sheet & 1040 Type ECF80 was first introduced in 1954. See also 1954 adverts.

 

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
PDF scanned from an original document held by the museum
Updated July 14, 2020.
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