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CV1286

Sensibly equivalent to:
6L6G CV1947 EL35 NR77
    
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The CV1286 is an audio output pentode with an 18 Watt anode dissipation. The prototype was the Mullard EL35. The old service code is NR77 and this is also on the envelope.
Through the internal coating can be seen the shape of the anode.
The anode is made of mesh. The cathode tube can be seen to be oxide coated and has a reduced diameter at the top to fit into a small hole in the top mica sheet. It is a true pentode with three wire grids.
The classic envelope is 44 mm in diameter, and excluding the IO base pins is 109 mm tall.
Reference: Datasheet.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
g2
g1
nc
h
k

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
6.3
1.35
250
250
-15.5
72
8.0
15,500
5.5
6W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 27, 2019.
shape:classic construction:pinch type:pentode age:1940.1950 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2 pin:5.g1 pin:6.nc pin:7.h pin:8.k
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