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Sleeve jan-6418 raytheon tube nos submini CK548DX
Sleeve JAN-6418 Raytheon Tube NOS NIB SubMini CK548DX. 1985 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.