General Electric GE 11BT11 Vacuum Tube Valve NOS NIB Type Sextal T18 Two are GE and two

Two are GE and two are Sylvania

34 and 35 where minimum (65%) is 25

I would rated it a 6

They are not suitable for guitar amp application as they are somewhat microphonic

This lot of six new old stock

General Electric GE 11BT11 Vacuum Tube Valve NOS NIB Type Sextal T18 Two are GE and twoThis GE 11BT11 tube tested to spec on our Paul Hart calibrated TV7 U. 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 PROBABLY HAVE IT. PLEASE ALSO SEE OUT ETSY