United Electron 31LQ6 Vacuum Tube Valve NOS-Testing January 28 2026 US Navy markings and excellent

US Navy markings and excellent flashing

new in box RCA Black Plate 6BK7B tube tested to spec on our Paul Hart-calibrated TV7/U

outstanding flashing

This album sounds bright

These tubes have tall bottles

United Electron 31LQ6 Vacuum Tube Valve NOS-Testing January 28 2026 US Navy markings and excellentThis new old stock testing United Electron 31LQ6 tube tested 120 on our Paul Hart calibrated TV7 U. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS. 1. MOST FORMS OF SHIPPING EXCEPT MEDIA MAIL ARE AUTOMATICALLY INSURED UP TO $100. ETSY PURCHASE PROTECTION COVERS ITEMS UP TO