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Description
Unmarked ceramic and metal tetrode. Appears to be a 4W300B radial beam power tetrode. Number etched on exterior is difficult to read but appears to be 3C-12536-Y. According to the 1960 product sheet, the 4W300B is "a compact radial-beam tetrode with a maximum plate-dissipation rating of 300 watts and a maximum input-power rating of 500 watts. Electrically identical to the Eimac 4X250B, it is intended for use where water cooling is preferred or where reserve anode dissipation is desired."
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