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6L7

Sensibly equivalent to:
ARH1 CV1951 X64
See also:
Pentagrid Converters - Metal Striptease
    
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The whole point of the 6L7 is to ensure maximum isolation between oscillator and signal, and to provide a mixer which is efficient at VHF where stable oscillation would require a separate VHF oscillator triode.
For applications where a self-oscillating mixer (ie pentagrid converter) could provide adequate performance there were other Octal types specifically designed for this purpose.
The oscillator injection needed to be 18 Volts peak to peak. The signal feed to the top cap is typical of the period to improve signal isolation.
The thin metal tube envelope is 23 mm in diameter and, excluding the IO base pins, is 81 mm tall.
References: Datasheet, 1040 & 1043. Type 6L7 was first introduced in 1936.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g2,g4
g3
-
h
k
g1

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
150
-6
3.3
8.3
1M
0.35
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 22, 2013.
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