5814A / 12AU7 3 MICA
Superb miniature glass preamp tubes manufactured in the 1950's and 1960's in the United States by RCA. These 9 pin double triode tubes come with triple mica internal supports, short black ribbed plates, and top D getters. They are printed in white RCA ELECTRON TUBE MADE IN U.S.A. with old style RCA logo, and variable 3 or 6 digit codes. They are also glass etched 5814A.