Vacuum tube type VT-231
||Printed in barely discernable silver ink around the glass envelope.
||Printed in white ink around the phenolic base.
overall: 2 7/8 in x 1 1/8 in x 1 1/8 in
This is a medium-mu twin triode in a glass envelope with an octal base, and is equivalent to the 6SN7GT. This is a spare tube for Register Driver S/N 6.