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PL504

Sensibly equivalent to:
27GB5 PL500
    
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The PL504 is a purpose designed television pentode line output valve. It was introduced as a replacement for the PL500.
The peak anode voltage is quoted as 7,000 Volts and shows why the line output stage of a television receiver was the last consumer electronics product to remain a valve. The CRT excepted of course.
TV line output valves found their way into amateur radio transmitters for service at HF (up to 30 MHz) because of their peak voltage characteristics and relatively high current capability.
The glass is discoloured indicating a hard service life. Line output valves were very much a stressed component within a television receiver.
The wide glass tube envelope is 28 mm in diameter, and excluding the B9D base pins, is 93 mm tall.
References: Datasheet & 1040. Type PL504 was first introduced in 1961.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
mAa
mAs
27
0.3
75
200
440
30
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 24, 2014.
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