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*****SELLING WORLD WIDE***** MATCHED PAIR KEN RAD MADE BLACK glass 6V6 7408 VT 107A WITHIN 5% OR LESS tube-tube.Stock photo >>>Class A (zero bias the only way to match power tubes) and what you look for in biasing output tubes.Google also say so. Having a minimum of, tube1) 37.3 ma tube2) 37.4 ma WITH DAN NELSON 'S NEWLY TV7 TUBE TESTER where 15 ma is minimum. >>>>>BUYERS AGREE WITH THIS TYPE OF TESTING OR ELSE DON'T BUY. ****** TUBES without test data is not sound decision,Listing ADS that say's "NOS", "test good" or "test strong" WITHOUT TEST RESULTS in vacuum tubes is not enough and avoid surprises.Tubes are mark for security purposes. ****** MY WORLDWIDE SHIPPING IS BY USPS MAIL. ******PLEASE CHECK MY OTHER COOL AUDIO STUFF.. *****QUESTIONS ARE ALWAYS WELCOME.