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EBF80

Sensibly equivalent to:
6N8 WD709 ZD152
See also:
Valves and their Habits
    
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The EBF80 is a variable μ amplifier pentode and a pair of signal diodes in the one envelope. Probably this was designed as the later EBF89 as final IF amplifier and AM detector. The other diode would provide AGC rectification.
The envelope has bothe the Mullard Type designation and the M-OV designation of WD709. Both appear on the box as well.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 56 mm tall.
References: Datasheet, 3002 & 1040. Type EBF80 was first introduced in 1950.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g2
g1
k,s
h
h
a
a(d1)
a(d2)
g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
85
-2
5.0
1.75
1.4M
2.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 19, 2014.
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