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PL500

Sensibly equivalent to:
27GB5 PL504
See also:
PL500 - Line Output Valve - Mullard PL500 & PY88 Advert - Valves for Dual Standard TVs Advert - EH90 Locked Oscillator and PL500 Advert - PFL200, PL500 & PY88 Advert - PL500 Advert
    
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The PL500 is a purpose designed television pentode line output valve (sweep tube). It was later replaced by the PL504.
The special feature of the PL500 was the introduction of the Cavitrap anode to reduce the ratio of screen grid to anode current. Although quoted as a pentode the construction is that of a beam tetrode.
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 wide glass tube envelope is 28 mm in diameter and excluding the B9D base pins, is 90 mm tall.
References: Datasheet & 1040. Type PL500 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
Pdiss
27
0.3
230
200
100
10
12W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 09, 2016.
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