Vacuum tube type SR1407
||Printed in silver ink on top of the glass envelope.
||Handwritten vertically in green ink on the glass envelope of the same tube.
||Stamped in green ink near the bottom of the glass envelope on one of the tubes.
overall: 3 1/8 in x 1 1/8 in x 1 1/8 in
Three tubes are included in this record. This is a Sylvania developmental power pentode in a glass envelope with an eight-pin loctal base. This is a spare tube for Bus Driver Arithmetic Rack S/N 10.
Gift of the Digital Equipment Corporation