Sylvania 5BC3 Vacuum Tube NOS NIB Wristwatch engraved base number 78 tubes

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

This beautiful new old stock

and Tube One has a TE4 date code

but I do not have a setting for it on our TV7/U

43 and 44 where minimum is (65%) is 36 and 100% is 55

Sylvania 5BC3 Vacuum Tube NOS NIB Wristwatch engraved base number 78 tubesThis new old stock, new in box Sylvania 5BC3 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 TO $250 IN