International 6HS5 Vacuum Tube Valve NOS NIB Melody Sings engraved base number 78 tubes

engraved base number 78 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

This tube has two additional vertical support rods

64 and 70 on our Paul Hart-calibrated TV7/U where minimum (65%) is 50

There is some marking in the first twenty pages or so

International 6HS5 Vacuum Tube Valve NOS NIB Melody Sings engraved base number 78 tubesThis new old stock, new in box International 6HS5 tube tested to spec 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