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PL508

Sensibly equivalent to:
17KW6
    
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The PL508 was designed for operation as a frame timebase output valve in late 1960s colour television receivers. The PL508 had to be capable of driving the convergence coils required by the early shadow mask tubes as well as the frame coils on the wide neck tubes.
The PL508 was used in the design of the Decca Bradford television chassis.
PL508 can withstand a positive surge of 2,500 Volts, and the heater is designed for use in a 300 mA chain. The low anode voltage is also aimed at the universal set without a mains transformer.
The PL508 is also rated for audio use and can deliver 12 Watts in single ended service. The ra value given is from the original Mullard data. Type EL508 is electrically the same but with a 6.3 Volt heater.
The heat radiating flanges and fixing points are placed in the centre of the working face for greatest effect. The anode side wall is pierced and we can see the grids.
The wide glass envelope is 28 mm in diameter and, excluding the B9D base pins, is 71 mm tall.
Reference: Datasheet. Type PL508 was first introduced in 1967.

 

Pin Connections
B9D
1
2
3
4
5
6
7
8
9
g1
ic
g2
h
h
a
k,g3
g1
1c

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
mAa
mAs
Pdiss
ra
17
0.3
190
190
60
5
12W
10,000
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 24, 2014.
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