General Electric GE 12EQ7 Vacuum Tube Valve NOS NIB Short Base These four GE 6X8A tubes

These four GE 6X8A tubes tested to spec on our Paul Hart-calibrated TV7/U

I am playing it in Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds fine

new in box GE 25C5 tube tested to spec on our Paul Hart-calibrated TV7/U

Their internal structures are all the same

General Electric GE 12EQ7 Vacuum Tube Valve NOS NIB Short Base These four GE 6X8A tubesThis new old stock, new in box GE 12EQ7 tube tested to spec on our Paul Hart calibrated TV7 U. BECAUSE OF THE BIZARRE, INTRUSIVE AND DRACONONIAN GERMAN PACKAGING REGULATIONS AND THE SEVERE FINES AND PRIVACY INTRUSIONS ASSOCIATED WITH IT 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 PROBABLY HAVE IT.