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
Mullard Logotypes
The logos above, engraved on the sides of the valves,
were
used from the release of the first PM3 and PM4 valves in 1925 until
about 1931 when the later logo, shown below and engraved on the top of
the valve was used.
From November 1st. 1922 until September 1924, all
valves
supplied in the U.K. had to bear a GPO
approval stamp. These, with minor variations, continued in use
until late 1927.
Early valves had the anode indication moulding
in-filled with
white
Many valves have lost the paper labels, shown intact
above.
