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PY32

Sensibly equivalent to:
PY33 U291
    
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The PY32 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 100 µF.
The PY32 was replaced by the PY33 that featured greater maximum current and twice the reservoir capacitance, suggesting a better surge rating and therefore a more emissive cathode.
The 300 mA heater was the standard for TV receivers from the 1960s.
The anode is carbonized to act as a better radiator. The anode sheets are formed into an X shape for maximum surface area.
The construction is modern with a pressed glass foot replacing the older pinch style of assembly.
The wide glass tube envelope is 32 mm in diameter and, excluding the IO base pins, is 95 mm tall.
References: Datasheet & 1040. Type PY32 was first introduced in 1955.

 

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
275
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 21, 2014.
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