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> Sleeve lot (5) rca 6BC4 tubes nos 1974 date code
Sleeve lot (5) rca 6BC4 tubes nos 1974 date code
Sleeve Lot (5) RCA 6BC4 Tubes NOS NIB 1974 Date Code
My tube tester is a SECO 107A Dynamic Mutual Conductance Tester. Good is at 60, but all tubes listed as NOS or NIB will have tested over 100, have no shorts, leaks or gas.