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DH63

Sensibly equivalent to:
6Q7G CV587 W1526
See also:
The 'Magic Three' Valves
    
Extras ▼

 

The DH63 is a double diode triode and was designed for receiver audio use.
The diodes would be for signal and AGC rectification and the triode would act as AGC amplifier or first audio amplifier.
The Marconi paper label.
The triode sits above the screen that conceals the rod anodes of the double diodes.
In this image the connection between the diode screen and the cathode can be seen. The diode anodes can be seen as two vertical rods either side of the heater connection.
The classic envelope is 39 mm in diameter and, excluding the IO base pins, is 101 mm tall.
References: Datasheet, 1040 & 1043. Type DH63 was first introduced in 1937.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
a(d2)
a(d1)
nc
h
k
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.3
250
-3
1
58k
1.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 20, 2019.
shape:classic construction:pinch type:double.diode.triode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.a(d2) pin:5.a(d1) pin:6.nc pin:7.h pin:8.k pin:tc.g1
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