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EABC80

Sensibly equivalent to:
6AK8 6LD12 6T8 DH719
See also:
Raphone EABC80 Box
    
Extras ▼

 

The EABC80 is a triple diode triode. The triode and two diodes share a common cathode but one diode has a separate cathode.
The EABC80 was specifically designed (1954) for use in the detector stage of early FM and FM/AM radios. The triode section providing the first audio amplification, the single diode and one of the diode pair were used as an FM detector in a ratio detector circuit. The other diode in the pair being used as the AM detector when that part of the circuit was required.
The shape of all the anodes face on. The rods to the sides of the grey anode are the risers for the heater connections that are all made above the top mica.
The three sections without holes in the anodes like our other examples. The heater connections can be seen at the top.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 59 mm tall.
References: Datasheet, 3002 & 1040. Type EABC80 was first introduced in 1952.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(d3)
a(d2)
k(d2),s
h
h
a(d1)
k
g1
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.45
250
-3
1.0
50,000
1.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 03, 2013.
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