Sensibly equivalent¶ to:
451PT 45A5 CV1977 MUL41 N142
The UL41 is an audio output pentode, and the design dates from 1947. The UL41 could produce 4.2 Watts at 10% distortion. This exhibit is from Brimar and was made in Hungary.
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. In 1955 the UL84 replaced the UL41.
The thin glass tube envelope is 21 mm in diameter with the base of the envelope containing the pip being 21.5 mm diameter. Excluding the B8A base pins the valve is 67 mm tall.
References: Datasheet, 3002 & 1040. Type UL41 was first introduced in 1947.
Absolute Maximum Operating Conditions¶
Updated February 07, 2013. shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b8a heater:100ma pins:8 pin:1.h pin:2.a pin:3.ic pin:4.ic pin:5.g2 pin:6.g1 pin:7.k.g3 pin:8.h