Clearing out overstock used tubes14 tested. (1) RCA-2500-2400, (2) RCA , 1950 -2150, (3) RCA 2050-2350, (4) RCA 2500-2050, (5) GE 2500-2400, (6) Westinghouse 2000-2250, (7) GE 2475-2500, (8) GE 2475-1900, (9) CBS 2050-2250, (10) GE 2800-2650, (11)RCA 2200-2200, (12) Stromberg Carlson 2300-2000, (13) Sylv. 2200-2400, (14) Tung Sol. 2475-2475. Hickok Tester number for test is 2200. As Is