6J7 V VISSEAUX FRANCE TUBE PAIR VALVE PREAMP KTZ63 348A Z63 6J7G AMPLIFIER RARE

6J7 V RT VISSEAUX MADE IN FRANCE TUBE SILVER COATED

PAIR TRIODE VACUUM TUBES VALVES  PREAMP

TEST RESULTS: FULLY TESTED 54 / 50 WITH TUBE TESTER CALIBRATED TV7D/U MILITARY GRADE ( REFERENCE GOOD IS 31 )

GENUINE ORIGINAL MADE IN  FRANCE , BLACK BASE

CERAMIC INSULATOR , PROFESSIONAL TUBES ULTRA RARE

BOX 102