Printed in silver ink on top of the glass envelope.
overall: 3 in x 1 1/4 in x 1 1/4 in
This is a medium-mu twin triode in a glass envelope with an eight-pin octal base. There is a 3 x 3 Post-it note stuck to this object. The following is printed in blue ball point pen on the note: "6SN7GT," "Sylvania 1939," "Dual triode used in ENIAC & Whirlwind & SAGE as flip-flop."