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EL84

Sensibly equivalent to:
6BQ5 6P15 CV2975 N709
See also:
High Quality Audio Amplification - A Small High Quality Amplifier - Transformerless Amplifiers - Current Limited 0-200V Supply
    
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Here is a modern version of the classic 12 Watt output pentode.
The control and suppressor grids are wound on copper supports and the control grid has heat radiating fins.
The hole in the anode reveals the three wire grids. The suppressor grid has a very open pitch.
The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 70 mm tall.
Reference: Datasheet. Type EL84 was first introduced in 1953.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
Pout
Pdiss
6.3
0.76
250
250
-7.3
48
5.5
6.7
2.2
12W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 07, 2017.
shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.ic pin:2.g1 pin:3.k.g3 pin:4.h pin:5.h pin:6.ic pin:7.a pin:8.ic pin:9.g2
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