Vacuum tube type 6L6GA
||Printed in silver ink on the glass envelope.
||Printed in white ink around the base of the tube; possibly an alternate tube number.
overall: 4 1/2 in x 1 3/4 in x 1 3/4 in
This is a beam-power tube with an 8-pin octal base; pin 6 is missing by design. This is a spare tube for Register Driver S/N 6.