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 FC4
Octode Frequency Changer
Mullard FC4
This octode frequency changer was used as an
oscillator/mixer in superhets after 1935. B7 base.
PDF Data Sheet