Vacuum tube type 7AK7
||Printed in silver ink on top of the glass envelope.
||Written in green ink near the bottom of the glass envelope.
||Written vertically in silver ink on the glass envelope.
overall: 3 1/8 in x 1 1/4 in x 1 1/4 in
This is a pentode in a glass envelope with an eight-pin loctal base. This is a spare tube for Delay Line Amplifier S/N 16.