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UCL82

Sensibly equivalent to:
10PL12 50BM8 LN119
    
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This exhibit is in excellent condition and is probably only lightly used. When used hard the inside of the envelope discolours.
The UCL82 triode pentode was designed for single ended audio output stages in universal mains domestic equipment, normally radios. In this application the output of 3 Watts was more than adequate for most rooms. For television use, with more valves in the chain, the 300 mA version the PCL82 would have been appropriate. The standard for AC mains sets using a mains transformer would have been the ECL82.
Bentley were a retailer and their valves were made outside the UK and here the envelope is marked as 'foreign'.
The power section is a true pentode and the suppressor grid support can be seen through the hole in the stitched anode. The triode is placed alongside the pentode and is the same height.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 69 mm tall.
References: Datasheet, 3002 & 1040. Type UCL82 was first introduced in 1956.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pdiss
Pout
D
50
0.1
250
250
-22.5
28
5.5
25,000
5.0
7.0W
3.4W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 12, 2015.
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