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6DR8

Sensibly equivalent to:
EBF83
    
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The 6DR8 from Mullard also carries the Mullard EBF83 type designation. The 6DR8 is an unusual low voltage double diode pentode valve. The 12.6 Volt anode rating, coupled with a standard 6.3 V 0.3 A heater, indicates operation from a vehicle battery and the car radio is the obvious application. This generation of hybrid car radios used germanium power transitors as audio output devices with a conventional valve front end.
The mesh screen obscures the construction but two side holes exist and through them it can be seen that the pentode is the lower section. The slope of the getter ring shows that when fired the filling is directed directly above the holder.
Greater detail of the inner construction.
The base section showing the spot welded connections to the electrodes.
See also ECC86, ECH83 and EF98.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 59 mm tall.
References: Datasheet & 1040. Type 6DR8 was first introduced in 1957.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g2
g1
k,s
h
h
a
a(d1)
a(d2)
g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
mAa
mAs
ra
gm
6.3
0.3
12.6
12.6
0.45
0.14
1M
1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 23, 2013.
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