342STANDARD_TUBE_SET NOS-12BH7 303STANDARD_TUBE_SET GROUPING_QUAD_MU-EL84 383STANDARD_TUBE_SET NOS-7408 412STANDARD_TUBE_SET GROUPING_QUAD_EH-6V6GT 532STANDARD_TUBE_SET GROUPING_QUAD_TS-EL84 382STANDARD_TUBE_SET GROUPING_QUAD_JJ-7591S 530STANDARD_TUBE_SET GROUPING_QUAD_SI-5881 413STANDARD_TUBE_SET GROUPING_PAIR_GL-B749 428STANDARD_TUBE_SET GROUPING_PAIR_SI-KT66 559STANDARD_TUBE_SET GROUPING_PAIR_GL-B759