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PY33

Sensibly equivalent to:
PY32 U291
    
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The PY33 is an HT rectifier for television receivers. It operates directly from the mains input and with a series resistance of 25 Ohms it will feed a reservoir capacitor of 200 µF. The 300 mA heater was the standard for TV receivers from the 1960s.
The advantage of the PY33 was a voltage drop across the valve of only 10 Volts made possible by an ultra smooth cathode coating.
The stitched anode was made with four heat radiating flanges in an X configuration.
The wide glass tube envelope is 32 mm in diameter, and excluding the IO base pins, is 94 mm tall.
References: Data-sheet & 1040. Type PY33 was first introduced in 1961.

 

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 October 01, 2019.
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