Tube, 4-15/32", EndYear: 12/31/1982

Used in models:340, 445, 755B, 550, 540A, 445A, A64, 555, 340A, 535, 6500, 420, A66, 340B, 555B, 545A, 450, 750, 540B, 335, 555A, 4610SU, 532, 7500, 515, 755A, 2600R, 3910V, 531, TW20, 3600, 7600C, 8000-SERIES, 5610, 9200, 6600, TW10, 4110V, 334, TW30, 4600SU, 3910R, 6600C, 9000-SERIES, 4600O, 3910N, 2910, 8600, 7610O, 3610, 2610, 2610V, 3610NO, 6710, 9600, 3910H, 6410, 3610V, 231, 3600R, 6700, 530A, 5900, 333, 7700, 3900, 8700, 6610O, 3600N, 8200, 230A, 2600V, 4610O, 5600, 4110O, 4610N, 3600NO, 2310, 5110, 234, 6600O, 9700, 233, 5700, 7710, 4110N, 4610NO, 6810, 7410, 4600NO, 4110NO, 4610V, 2600N, 3600V, 2810