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U291

Sensibly equivalent to:
PY32 PY33
    
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The U291 is an HT rectifier for television receivers. It operates directly from the mains input and with a series resistance of 76 Ohms it will feed a reservoir capacitor of 100 µF. The 300 mA heater was the standard for TV receivers from the 1960s.
The wide glass tube envelope is 30 mm in diameter and excluding the IO base pins the length is 94 mm.
References: Datasheet & 1040.

 

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

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
29
0.3
250
325
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 21, 2014.
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