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6EM7

Sensibly equivalent to:
6EA7
    
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The 6EM7 double triode was purpose designed for 525 line American television receivers. The valve contains two triodes of different construction. The number one unit is a high gain low current design for service as a frame oscillator whilst the number two unit is a low voltage high current design for the vertical output stage driving the deflection coils.
Both anodes are blackened box structures. In the image above the amplifier triode anode is in the foreground.
In this view the amplifier triode is on the right. The large anode with cooling fins is on the left. Note the cooling fins above the top mica to radiate heat away from the control grid. The grid support wires are substantial and made of copper for good heat conduction.
The power triode is in the foreground with the large anode structure. The smaller amplifier triode is seen as small structures on the right of the top mica.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 69 mm tall.
Reference: Datasheet. Type 6EM7 was first introduced in 1960.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
g1(2)
a(2)
k(2)
g1(1)
a(1)
k(1)
h
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.3
0.925
250
-3
1.4
40,000
1.6
68

 

Absolute Maximum Operating Conditions
Triode
Va
Vg
mAa
ra
gm
μ
150
-20
50.0
750
7.2
5.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 21, 2014.
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