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*****SELLING WORLDWIDE***** >>>>>THESE ARE PLATINUM MATCHED TUBES(WELL-BALANCED TRIODE-TRIODE & TUBE-TUBE IN TRANSCONDUCTANCE AND PLATE CURRENT). *****PAIR SYLVANIA 6SN7 GTA,USED,Stock Photo, SHORT BOTTLE,FULL BASE,BLACK T-PLATES,GUARANTEED SYLVANIA MADE TUBES,0-25% PRINT/LABEL VISIBLE,TIGHT BASE AND NO CRACKS.THE SAME QUALITY AS THE BRANDED BUT FOR LE$$. >>>>>ALSO AVAILABLE IN PLATINUM MATCHED QUAD. **TWICE TESTED, *****1st) NO SHORTS NO GAS AND VERY STRONG Gm. *****2nd)INDIVIDUALLY LIVE AUDIO TESTED USING DYNACO PAS II ,THIS IS THE MOST IMPORTANT TEST THAT YOU CAN DISREGARD OTHER BUT NOT THIS ONE,NO HUM & NON-MICROPHONIC IN MY MODIFIED DYNA PAS II. ****Having a minimum of, TUBE1) 2800/2850 & 7.2/7.4 ma TUBE2) 2800/2850 & 7.1/7.3 ma uSIEMENS & PLATE CURRENT WHERE 2100/2100 uSIEMENS IS nominal / average VALUE ANS NOS START AT 2600/2600 uSIEMENS WITH HICKOK TESTER. ***** TUBES WITHOUT TEST DATA IS NOT WISE DECISION AND LISTING THAT SAY'S "NOS", "test good"OR "test strong" IN VACUUM TUBES IS NOT ENOUGH AND AVOID SURPRISES. ****** MY WORLDWIDE SHIPPING ARE ACTUAL USPS REGISTERED MAIL. ******PLEASE CHECK MY OTHER COOL AUDIO STUFF.. *****QUESTIONS ARE ALWAYS WELCOME.