1961...Sylvania 10-pin double tetrode tubes are presently used by Sarkes Tarzian in their new FM...
12
1961...Sylvania 10-pin double tetrode tubes are presently used by Sarkes Tarzian in their new FM tuner. NEW 12-PIN TUBES-SYLVANIA 12-T9, 12-T12 TYPES-Presently under devel- opment
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