8 RCA 6S4 6S4A Vacuum Tubes NOS NIB Lot Of Eight Symphonie 1 Transconductance measured 68/64 where minimum

Transconductance measured 68/64 where minimum (65%) is 36/36

They have horse shoe getters

dark-gray plates and a bottom dimpled-sheet getter

Plates: black/dark gray rounded plate

8 RCA 6S4 6S4A Vacuum Tubes NOS NIB Lot Of Eight Symphonie 1 Transconductance measured 68/64 where minimumThis lot of eight new old stock, new in box RCA 6S4A tubes tested to spec on our Paul Hart calibrated TV7 U. Seven are 6S4As and one is a 6S4, 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