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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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Brimar data sheets show this triode pentode valve as designed for VHF frequency changer use. Mullard say that the ECF80 was designed for operation up to 220 MHz. This would be mainly for radio as television receivers tended to use the PCFnn 300 mA valves.
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 housed in the one envelope. The two valves can be used separately if required.
The thin glass tube envelope is 19 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
5.5

 

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 March 08, 2020.
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