Vacuum tube type 7AK7
||Printed in silver ink on top of the glass envelope.
||Written vertically in green ink on the glass envelope.
||Stamped in green ink near the bottom of the glass envelope.
overall: 4 1/8 in x 1 1/8 in x 1 1/8 in
This is a pentode vacuum tube with a loctal base. This is a spare tube for 306-307 Multiply Control Register S/N 1.
Gift of the Digital Equipment Corporation