4 Sylvania 7B4 Vacuum Tubes NOS NIB Lot Of Four JTL-6206 6206 Transconductance measured 44 and 48

Transconductance measured 44 and 48 where minimum (65%) is 35

These tubes have pretty gray and silver bottles

They measured 53 (black glass)

new in box US-made 12BR7 tubes tested to spec on our Paul Hart-calibrated TV7/U

This black plate Sylvania 5Y3GT rectifier tube was tested on our Paul Hart-calibrated TV7/U for shorts

4 Sylvania 7B4 Vacuum Tubes NOS NIB Lot Of Four JTL-6206 6206 Transconductance measured 44 and 48These new old stock, new in box Sylvania MANUFACTURED, Kenton LABELED 14BR11 tubes 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