A matched pair of new old stock Sylvania 6146B/8298A beam power amplifier vacuum tubes. One tube tests 7315 uMhos and the other 7220 uMhos-baseline acceptable 4750 uMhos. One tube tests 112 ma, the other 111 ma. plate current in test condition. Tested on Hickok AN/USM-118B or 539C tube tester. Tubes are from several production bulk packs. Will be packaged in white tube boxes.