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
807
The 807 and its many variants is another of the
'valves that won the war'. It was by far the most common final RF power
amplifying valve in transmitters of the period and was frequent in
Amateur use into the '60s. It was also used as a driver for the 813 in
higher power applications. It was really a 6L6,slightly redesigned for
RF use, with the anode brought out to the top cap. Early (and better)
versions had ceramic bases. The later micanol or bakelite bases were
introduced to raise production and lower cost but these valves were
much less stable in operation above 20 MHz. This was often not a
concern for military applications but was important to amateurs.
