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,
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EL84, EM34, EM80, EM81, EM85, Mullard, Cossor, GEC, Gold Lion,
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Mazda AC2/Pen
10W Audio Output Pentode
Mazda AC2/Pen
B7 base.