Tube 12SL7GT Made in USA

12SL7 Nos Fivre Quad Tube NOS NIB Made In Italy Early Older Valves Produced in the 1940's Black Plate Robusta Long Life Black Hole Plate Anode Round Fat Plates Black Base Fatboy Badboy Short Bottle Thick Black Socket Yellow Label Large D Getter Bottom Solid mica on top 12SL7GT = 12SL7 = VT-289 = CV924 Similar tube heater Different: 6SL7GT Other base: 14F7 First Information 02.Lug.1941 : Electronic tube registration list Submodel 12SC7 Evolution 12AX7 Octal socket (int.octal, IO) K8A Filament heater Vf 12.6 Volt / If 0.15 Ampere / Indirect / Parallel / Series ~ = AC/DC