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PM5D

 
See also:
Mullard PM5D Box
    
Extras ▼

 

The PM5D is a battery operated directly heated triode.
The etched lettering gives the filament voltage as 6 and the maximum anode voltage as 150.
The electrodes are obscured by the coating but it is possible to see the construction looking up from the base. The anode lies horizontally and the grid wires extend to outside of the anode box.
The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 88 mm tall.
References: 1931 datasheet & 1043. Type PM5D was first introduced in 1930.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.0
0.075
150
-3
1.2
20k
1.3
26
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated December21, 2012.
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