Produced in 1961 for the US Navy, these USN GE 6386 Triple Mica Black Plate 6386 are ruggedized computer rated version of the 2c51 396a tube with a D getter. Absoutley the best of the best for the Gates STA-LEVEL Compressor, FAIRCHILD 670 compressor, and Manley Variable Mu Stereo Limiter/ Compressor. New, Unused, from 1950’s. NOS In original RCA branded box, made by GE. We currently have one piece available of the triple mica version with bent D getter. Please see our other listing for the two mica version. Price is per tube.