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CV5077

Sensibly equivalent to:
21A6 PL81
    
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The CV5077 is a PL81 in UK service form, physically it is identical to the PL81. It was designed for universal mains television sets, i.e. without a mains transformer and with the heaters on a series chain. Parameters given are for a pair in push pull audio service, but this was never the design use.
As a line output valve in monochrome television service, the design use, the peak anode surge voltage is 7,000 Volts. The anode dissipation is 8 Watts.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 71 mm tall.
References: Datasheet & 1040.

 

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 October 16, 2013.
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