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D026

 
See also:
Mullard AC Mains Valves
    
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The DO26 is an audio output triode from Mullard. It has a lower impedance than the DO24 and thus a higher output. The anode dissipation is around 25 Watts.
The filament passes through the valve six times.
The main characteristics and Mullard name are on the dome.
The original early 1030s box.
The main operating details are printed on the box.
The top of the box.
The valve is retained by a shaped card interior.
The images have been taken from an ebay listing.
The balloon envelope is  mm in diameter and, excluding the B4 base pins, is  mm tall.
References: Datasheet, 1040 & 1043.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
rk
rl
Pout
D
4.0
2.0
400
-92
63.0
950
3.8
1,500
3,000
7.5W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 11, 2020.
shape:balloon construction:pinch type:triode age:1930.1940 base:b4 heater:4.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f
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