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.

Peter Bates, who donated some PY32's, comments that he has tested many PY32's and generally the older style twin cathode PY32's last longer than the later single system valves like this one.

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 wide glass tube envelope is 30 mm in diameter and, excluding the IO base pins, is 92 mm tall.

 
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

More

This exhibit was last updated on 11 November 2008