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PM12

Sensibly equivalent to:
215SG S215A S215 S21 SG215 VW48
See also:
Mullard PM12 Box - Mullard PM12, PM1HL & PM2A Advert - Mullard PM12 Advert - Mullard Pentone and SG Valves Advert - Mullard PM12, PM1HL and PM2A Advert - Mullard 2 Volt Valves Advert
    
Extras ▼

 

The Mullard PM12 is a battery Screen Grid valve for HF amplification in wireless receivers.
The 12 and the BVA logo.
The Mullard logo is very feint and so this image is heavily processed.
The gettering prevents any observation of the inner construction.
The balloon envelope is 44 mm in diameter and, excluding the B4 base pins, is 101 mm tall.
References: Data-sheet & Data. Type PM12 was first introduced in 1927. See also 1927 adverts.

 

Pin Connections
B4
1
2
3
4
tc
g2
g1
f
f
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
μ
2.0
0.15
150
75
-1
-
-
0.18M
1.1
200
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 12, 2024.
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