Vacuum tube type 7AK7
||Printed in silver on top of the glass envelope.
||Written in silver ink near the bottom of the glass envelope.
||Written vertically in silver ink on the glass envelope.
overall: 3 in x 1 1/8 in x 1 1/8 in
This is a pentode in a glass envelope with an eight-pin loctal base. This is a spare tube for Bus Driver Flip-Flop Storage Rack S/N 6.
Gift of the Digital Equipment Corporation