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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 on this M-OV valve.
The Triode is at the top with the diodes below a central mica. The bright box is the screen and the diode anodes are the two rods either side of the common cathode.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 97 mm tall.
References: Data-sheet, 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 September 23, 2020.
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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