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UABC80

Sensibly equivalent to:
10LD12 28AK8 DH109
See also:
FM Broadcasting and Signal Detection
    
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The UABC80 is a triple diode triode on a B9A base.
The UABC80 and its 300 mA brother PABC80 were specifically designed for use in the detector stage of early FM and FM/AM radios. Normally this valve featured in a ratio detector circuit for FM demodulation and a diode detector for AM as well as the first stage of audio amplification.
Three separate valves exist within the envelope. The triode is at the left end, the single diode at the right. In the middle is the double diode, with each half of the box anode insulated from the other.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins, is 58 mm tall.
References: Datasheet, 3002 & 1040. Type UABC80 was first introduced in 1952.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
28
0.1
200
-2.3
1
50k
1.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 03, 2013.
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