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PY500A

Sensibly equivalent to:
42EC4
    
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The PY500A is an efficiency diode for television service. As an efficiency diode its function is to return energy to the anode rail from the collapsing field in the line output transformer. This generates high peak currents and the PY500A has a maximum peak current rating of 800 mA. Note that unusually the cathode is brought out to the top cap.
The wide glass tube envelope is 27 mm in diameter and, excluding the B9D base pins, is 103 mm tall.
Reference: Datasheet. Type PY500A was first introduced in 1967.

 

Pin Connections
B9D
1
2
3
4
5
6
7
8
9
tc
ic
a
ic
h
h
ic
a
a
ic
k

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
40
0.3
5,600
440
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 22, 2013.
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