Check the listing for details. 6SN7 GTA SYLVANIA NOS IN BOX TALL GLASS PLATINUM MATCHED PAIR #2. Condition: New. Listed at 214.74 USD. *****SELLING WORLDWIDE*****THESE ARE PLATINUM MATCHED PAIR TUBES(well-balanced triode-triode & tube-tube in transconductance and plate current).Very Low Noise.>>>>NOS PAIR SYLVANIA 6SN7 GTA TALL GLASS,SAME DATE CODE.PREMIUM QUALITY.98%-99% PRINT VISIBLE.tUBES WILL BE SUPPLIED IN NEW SYLVANIA BOX."STOCK PHOTO"ALSO AVAILABLE IN QUAD.>>>>>.EXCELLENT REPLACEMENT OF RUSSIAN/CHINESE RE-ISSUE.****TWICE TESTED; 1st)NO SHORTS,NO GAS AND VERY STRONG TRANSCONDUCTANCE. 2nd) TUBES ARE NOT USABLE UNLESS THEY ARE LIVE AUDIO TESTED WITH NO HUM and NON-MICROPHONIC.TESTED USING MODIFIED DYNACO PAS 3 & TUBE OTL Having a minimum of,TUBE1)3000/3050 uSIEMENS & 7.6/7.6 maTUBE2)3050/3050 uSIEMENS & 7.6/7.8 ma WHERE 2100/2100 IS MINIMUM AND NOS START AT 2600/2600 uSIEMENS WITH HICKOK TUBE TESTER. *****TUBES WITHOUT TEST DATA IS NOT SOUND DECISION & LISTING ADS THAT SAY'S "TEST GOOD" or "TEST STRONG" WITH HIDDEN TEST RESULTS IN VACUUM TUBES IS NOT ENOUGH AND AVOID SURPRISES. ****** INTERNATIONAL SHIPPING IS ACTUAL USPS REGISTERED MAIL.SOME COUNTRIES HAS LOWER S&H,SEND EMAIL TO GET QUOTE.. *****QUESTIONS ARE ALWAYS WELCOME.