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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 were designed to operate with a heater chain across the mains 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 suggested for correctly biasing the UL41 was 160 Ohms.
The UL46 is electrically very similar to the UL41 but the base connections differ and it was designed for video output.
The base of the envelope containing the pip is 21.5 mm in diameter.
The two halves of the anode are held together by being stitched as shown.
The copper control grod supports are fitted with small heatsinks at the top.
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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