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PM6

 
See also:
The Philips-Mullard (PM) Series - The Azide Process - Mullard PM6 Box
    
Extras ▼

 

The PM6 is a Philips/Mullard Azide audio output triode. This exhibit carries the third version of the BBC stamp and thus dates to about 1927. The design was released in 1926 (first characteristic table) and an improved version released in 1929 (second set of valve characteristics).
The improved valve was designed to work into an 8,000 Ohm load and produce 160 mW.
The first batches of the PM6 had a raised line down the side of the base to denote the anode pin. This line was filled with white paint. This exhibit does not have this feature.
The paper label has been applied upside down.
The box anode lies horizontally within the envelope.
The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 93  mm tall.
References: 1931 datasheet & 1043. Type PM6 was first introduced in 1926.

 

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
0.1
100
-9
-
5,700
1.25
7.1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.0
0.1
150
-9
-
3,550
2.25
8
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated December21, 2012.
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