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6BE6

Sensibly equivalent to:
5750 CV453 EK90 HM04 X727 X77
See also:
Pentagrid Converters - CV453 short entry
    
Extras ▼

 

The 6BE6 is a heptode or pentagrid valve. The heptode is classically used as a frequency changer in a superhet receiver.
Radio and Television both use the superhet principle. To change frequency the incoming signal is mixed with a local oscillator. The electron stream is effectively switched on and off by the oscillator. In practice the process is one of producing sum and difference frequencies via a non linear response rather than just mixing of two signals linearly.
To prevent the oscillator and the signal interfering in unplanned ways a screening grid keeps the circuits apart.
The solid anode obscures most of the inner detail. At the base the second grid support can be seen to be plain without notches, this is because it is just a pair or rods to act as the oscillator triode anode.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 45 mm tall.
References: Data-sheet & 1040. Type 6BE6 was first introduced in 1950.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k
h
h
a
g2,g4
g3

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Vosc
6.3
0.3
250
100
-1.5
3
7.1
1M
0.475
10
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 16, 2021.
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