This object is a high-mu twin triode in a glass envelope with an octal base. A 3 x 5 index card is Scotched-taped around the tube, obscuring anything printed thereon. The following is printed in red felt pen on the card: "NR3127 - Box 1 - #14," "RCA," and "2 - 6SL7." The tube type is obscured by the card, so it is unknown if this is a "6SL7" or a "6SL7GT"; the former is an earlier obsolete version of the tube. There is also a description printed in pen: "dual triode used in ENIAC and in early hi-fi equipment."