Beautiful pair of RCA black plate 6L6GC tubes, NOS new in original boxes, code GA from 1977. They both test STRONG, NEW and MATCHED - happiness GUARANTEED & NO DOA - matched plate current, GM and manufactured on the same month and year, CODE GA. - So these are as close as they can get. Perfect function and sound. One unit has a couple of marks on base…otherwise looks all new. Checked on multiple calibrated testers and checked by ear - they’re wonderful! These are  the real original production RCA Black Plates. They have dark coating, huge full chrome mirror flashing and the 2x side getters.