In the context of vacuum tubes, NOS tubes are tubes that were manufactured in the past but were never sold or used. Tv7 tested TUBES. NOS is subject to interpretation and there is no specific definition for it either.
1 NOS Marconi 12SN7GTA Vacuum Tube – Vintage Audio Twin Triode – Made in Canada
1 NOS Marconi 12SN7GTA Vacuum Tube. Hickok TV-7D/U tests read 107/112. Made in Canada.
Matched NOS Pair GE 12SN7GTA Tall Black T Plates Made in Canada Tests NOS
Matched NOS Pair GE 12SN7GTA Tall Bottle Tube | Black T Plates 3 Hole | D Getters | Made in Canada. Tube 1 Emissions 106% & 101% | GM 111% & 103%. Tube 2 Emissions 100% & 102% | GM 103% & 100%.
NOS NIB Matched Quad RCA 12SN7GTA Audio Tubes 1969
Great for any audio amplifier. These tubes are what audiophile enthusiasts are looking for. Th ese tubes were tested in my Military Hickok Cardmatic to make sure these were great. All the tests were excellent, within 4%.
1 X 12SN7GTA ULTRON TUBE. RECTANGLE. GETTER. COPPER RODS. 18. CH135
1 X 12SN7GTA TUBE. 1960s PRODUCTION. GREY PLATES, RECTANGULAR GETTER, COPPER RODS.