12BY7 / 12BY7A / 12BV7


Miniature power pentode (really a beam tetrode....) = 12v centre tapped filament. Commonly used transceiver/transmitter driver tube with 6.25 to 7 watts or so plate dissipation. NOS - Various brands including Sylvania, Philips, RCA, Rogers, Ten etc.... Common driver tube for hybrid and valve transceivers and transmitters. For the purpose of driving two 6146B's there is no sensible difference between the three valve numbers...

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