6SN7 MARCONI TUBE MATCHED PAIR = 2 TUBES TYPE 6 SN 7 = B65 MADE IN ITALY #FULLY TESTED AND MATCHED # PERFECT FOR PRE-AMPLIFIER # BEST SOUND # PHONO # PRE-AMP STAGE # PRE AMPLIFIER # DRIVER TUBE # DRIVER FOR 211 # BEST VALVE DRIVER # 1950's TEST RESULTS: TUBE 1 TRIODE 1: 120 (WHERE 50=100%) TRIODE 2: 120 (WHERE 50=100%) TUBE 2 TRIODE 1: 120 (WHERE 50=100%) TRIODE 2: 120 (WHERE 50=100%) VERY RARE!!  COPPIA H