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UL41

Sensibly equivalent to:
451PT 45A5 CV1977 MUL41 N142
    
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The UL41 is an audio output pentode from 1953. The U series, 100 mA heater, were designed to operate with a heater chain across the mains. 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 suggested for correctly biasing the UL41 was 160 Ohms.
The anode encloses the grid/cathode assembly.
The control grid is fitted with small cooling flanges.
The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 68 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 February 07, 2013.
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