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,
osram philips, rank, raphone, raytheon, rca, rft, selectron sovtek,
standard, svetlana, sylvania, telefunken, tronix, tungsram united,
valvo, westinghouse, zaerix
Tungsram P215
Tungsram Hungary, "Barium Tube" possibly
using the Azide process? Early 30's. 2 volt, 150 mA filament,
maximum anode voltage 150 V. Grid bias -12 V, ra 3.3 kOhms, gm 1.5
mA/V, mu 5. Recommended load resistance 7 kOhms. B4 base.
Equivalent to the Mullard PM2. The
characteristics can be found at the top of the fourth section -
Triodes with resistance less than 7000 ohms - of this .pdf file. I
have very little information on these so any information would be
very much appreciated. Mail me here if you can help.
