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6H6

Sensibly equivalent to:
CV1930 D63 VT-90
See also:
Metal Striptease - The 6H6 Diode Family
    
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The 6H6 is the smallest of the mid 1930's metal valves. The construction is of a pressed glass foot holding the electrodes and sealed into the steel envelope. The lead-out wires were then attached to the octal base, also introduced in America in 1935.
In the metal envelope, and sharing a common heater connection are two separate signal diodes. Such a device could be used in FM demodulation and a host of other low level rectification. We do not have details of the original design application beyond military communications. An American television textbook of 1950 uses these valves extensively as level clamping diodes.
The original identification has been removed and the Colomor text added. Colomor were a UK reseller.
The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 28 mm tall.
References: Data-sheet & 1040. Type 6H6 was first introduced in 1935. See also 1935 adverts.

 

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

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
6.3
0.3
150
8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 08, 2024.
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