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Top of the line octal-based metal twin-diode tubes manufactured for the US military by RCA, but boxed by Sylvania. Two separate rectifier sections allow flexibility as diode detectors, low drain power rectifiers, or AGC rectifiers. Tubes are low profile, printed JRC 12H6 MADE IN U.S.A. with old style RCA logo, eagle badge, and coded 4-30. Wrapped in heavy duty waxed paper, then boxed in giant brown military boxes labelled USAF STOCK NO. 3300-234-950-000 PART NO. 2J12H6 ITEM NO. 1-265 CONTRACT NO.AF33-600-23261 METHOD 111 DATE SEPT 54 SYLVANIA ELECTRIC PRODUCTS INC. BUFFALO N.Y.