Sylvania 6BL8 ECF80 Vacuum Tube NOS NIB Find 2022 tube 59-13 188-5 and 57-26 188-5

59-13 188-5 and 57-26 188-5 date/factory codes

It measured an almost-perfectly-balanced 59/57 where minimum (65%) is 40/40 and 100% is 62/62

rounded rectangles

new in box milspec Tung-Sol JTL-5702WB tubes tested to spec on our Paul Hart-calibrated TV7/U

It measured a nicely-balanced 52/50 where minimum (65%) is 40/40 and 100% is 62/62

Sylvania 6BL8 ECF80 Vacuum Tube NOS NIB Find 2022 tube 59-13 188-5 and 57-26 188-5This new old stock, new in box Sylvania 6BL8 ECF80 tube tested to spec on our Paul Hart calibrated TV7 U. It was made in the USA. 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