Sylvania 12SK7 12SK7GT Vacuum Tube Valve NOS-Testing Mitch Miller new in box US-made 6KU8

new in box US-made 6KU8 tubes tested to spec on our Paul Hart-calibrated TV7/U

Tube One measured 76/76 and Tube Two measured 79/77 where minimum (65%) is 50/50

10-15% OF THEM ARE NOT SUITABLE FOR HIGH END AUDIO APPLICATIONS

This lot of two National Union type 85 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

this unique -- and nicely-framed -- work of art captures the raw

Sylvania 12SK7 12SK7GT Vacuum Tube Valve NOS-Testing Mitch Miller new in box US-made 6KU8This new old stock testing Sylvania 12SK7GT tube tested 64 on our Paul Hart calibrated TV7 where minimum (65%) is 48. BECAUSE OF THE BIZARRE, INTRUSIVE AND DRACONIAN GERMAN PACKAGING REGULATIONS AND THE SEVERE FINES AND PRIVACY INTRUSIONS ASSOCIATED WITH THEM WE NO LONGER SHIP TO GERMAN ADDRESSES. WE WILL HAPPILY SEND YOUR PACKAGE TO A NEIGHBORING COUNTRY OR MAKE SUITABLE ARRANGEMENTS. IN 2021 WE PURCHASED 150,000 VACUUM TUBES. IF IT'S NOT LISTED, WE