4 Sylvania 12AX4 12AX4GTA Vacuum Tubes Valves NOS NIB Lot Of Four Mozart Für Bläser This hard cover book is

This hard cover book is in very good condition

Transconductance measured 58 for Tube One and 60 for Tube Two where minimum (65%) is 40

These two Philco 6U7 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Both tubes have 2-48 SC 471 date/contract codes and are World War Two vintage

new in box milspec (US Navy) Raytheon CRP-78 number / type 78 tube tested to spec on our Paul Hart-calibrated TV7/U

4 Sylvania 12AX4 12AX4GTA Vacuum Tubes Valves NOS NIB Lot Of Four Mozart Für Bläser This hard cover book isThese four new old stock, new in box Sylvania 12AX4GTA 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 PROTECTION COVERS