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PL81

Sensibly equivalent to:
21A6 CV5077 N152 N359
See also:
Series Pass Valves - Valves and their Habits - Timebases for 90° Scanning Advert - 15 Watt DC/AC Amplifier Advert - PL81 Advert
    
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The PL81 was designed for universal mains sets without a mains transformer and with the heaters on a series chain. The parameters given are for a pair in push pull audio service.
As a line output valve in television service, the peak anode surge voltage is 7,000 Volts. The anode dissipation is 8 Watts.
Mullard also specify the PL81 for use as a series pass element in voltage regulators.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 71 mm tall.
References: Datasheet & 1040. Type PL81 was first introduced in 1951.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
tc
ic
g1
k
h
h
ic
ic
g2
g3
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
Pout
D
21.5
0.3
200
200
-31.5
87
12.5
20W
5.5%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 06, 2016.
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