Printed in silver letters toward the top of the glass envelope.
Printed in green ink around the bottom of the glass envelope.
Partially illegible, printed vertically in green ink on the glass envelope.
overall: 2 1/8 in x 7/8 in x 7/8 in
This object is a medium-mu twin triode packaged in a miniature glass envelope with nine pins. It is a digital-service grade similar to the 12AU7 medium-mu twin triode with lower gain. There is a circle painted in green ink around the top of the tube.