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

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

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

32 and 52 where minimum (65%) is 36 and 100% is 55

Tube Four (diodes): 55/62

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