Vacuum tube type 7AD7
||Handwritten in red ink near the bottom of the glass envelope.
||Printed in silver on top of the glass envelope.
overall: 3 1/8 in x 1 1/4 in x 1 1/4 in
This is a power pentode in a glass envelope with an eight-pin loctal base. A ring was drawn in red ink around the top of the envelope. This is a spare tube for Bus Driver Flip-Flop Storage Rack S/N 6.
Gift of the Digital Equipment Corporation