4 RCA 12Z3 Vacuum Tubes NOS NIB Lot Of Four Shoulder ST Style They tested 54

They tested 54

Five are Sylvania and one is National Union

They measured 90/82 for Tube One and 91/84 for Tube Two where minimum (65%) is 57/57

This pair of new old stock

Tube One measured 17

4 RCA 12Z3 Vacuum Tubes NOS NIB Lot Of Four Shoulder ST Style They tested 54These four new old stock, new in box RCA 12Z3 tubes tested to spec on our Paul Hart calibrated TV7 U. One is milspec and one is a Cunningham. 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