valve, tube, thermionic, electron, triode, tetrode, pentode, power,
magic eye, tuning indicator, nixie, history, data, data sheet,
specification, amplifier, radio, octal, B9A, B7G, B4, IO, KT88,
KT66, 12AX7, 12AY7, 12AT7, ECC81, ECC82, ECC83, 6L6, 6V6, EL34,
EL84, EM34, EM80, EM81, EM85, Mullard, Cossor, GEC, Gold Lion,
Marconi, Svetlana, Brimar, Ferranti, RCA, Sylvania, GE,6202,
amperex, arcturus, brimar, channelmaster, colvern, cossor dario,
debanks, edicron, ediswan, ei, elpico, emi emston, era, eratron,
ever-ready, ferranti, ge, gec heinz, kaufman, haltron, hivac, hrs,
itt, jackson lamba, lorenz, marconi, mazda, mullard, national,
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standard, svetlana, sylvania, telefunken, tronix, tungsram united,
valvo, westinghouse, zaerix
PM3 Azide Triode
Detector and first audio triode, 4 V, 75 mA
filament. Maximum anode voltage 150 V, grid bias -6 V, mu 14, ra 13
kOhms. Cost 14/- in 1931, equivalent to £109 today!
Here is a later one with a top logo and a box for a
1925/6 version.


PDF Data Sheet