National Union NU 12BA7 Vacuum Tube Valve NOS NIB 6HM5 Septal but followed the original score

but followed the original score and was recorded in the latter 1950s

43 and 44 where minimum (65%) is 30 and 100% is 47

Dynamic Range: -77

Kenton-LABELED 14BR11 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box RCA 13GF7 13GF7A tubes tested to spec on our Paul Hart-calibrated TV7/U

National Union NU 12BA7 Vacuum Tube Valve NOS NIB 6HM5 Septal but followed the original scoreThis new old stock, new in box National Union 12BA7 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