Vacuum tube type 6SN7GT
||Printed in silver ink on top of the glass envelope.
||Handwritten in silver ink vertically on the glass envelope.
overall: 2 7/8 in x 1 1/8 in x 1 1/8 in
This is a medium-mu twin triode in a glass envelope with an octal base. This is a spare tube for Register Driver S/N 6.