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UL41

Sensibly equivalent to:
451PT 45A5 CV1977 MUL41 N142
    
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The UL41 is an audio output pentode. The U series were designed to operate with a series heater chain in the days when AC mains had not reached all parts of the country. These universal sets contained no mains transformers and the valves were designed for low anode voltage and higher anode current to provide adequate output.
The UL41 could produce 4.2 Watts at 10% distortion. The cathode resistor 160 Ohms. The base of the envelope containing the pip is 21.5 mm in diameter.
The reverse of the envelope carries the BVA initials and that fact that it is a British made product.
The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 69 mm tall.
References: Datasheet, 3002 & 1040. Type UL41 was first introduced in 1947.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
ic
ic
g2
g1
k,g3
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
45.0
0.1
170
170
-10.4
53
10
20,000
9.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 24, 2014.
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