Pair GE 5 Star 6201 (12AT7WA) Preamp Tubes - Black Plates D Getters 3 Mica

(Pair GE 5 6201 (12AT7WA) Preamp Tubes. 3 Mica Black plates. Black Plates. 1) GM1 = 3100, GM2 = 3800. Test results.

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