There are six tubes covered by this record. This is a power pentode vacuum tube with a loctal base. This is a spare tube for Bus driver arithmetic rack, S/N 10. There are no complete legible markings on these tubes.
Date
ca. 1951
Manufacturer
Sylvania
Place Manufactured
U. S.
Identifying Numbers
Model number
6145
Printed in silver ink on top of the glass envelope.