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U801

 
See also:
Valves and their Habits - Valves at the 1950 Radio Exhibition
    
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The U801 is a television HT rectifier. The rating is given as 1,500 Volts PIV. The unusual feature is the fact that the construction is as a pair of full wave rectifiers within the envelope. The general belief is that the U801 with its very high heater rating was unreliable due to the fragile heater. Additionally it seems to have been prone to shorting out.
See U801 for more details.
The four anodes point to the centre but, of course, do not touch.
Each cathode is round and the heater is kept separate from it.
The classic envelope is 54 mm in diameter, and excluding the IO base pins is 108 mm tall.
References: Private communication & 1040. Type U801 was first introduced in 1950. See also 1950 adverts.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
k(1)
h
a(1)1
a(1)2
a(2)1
a(2)2
h
k(2)

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
80
0.2
Updated March 04, 2022.
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