Vacuum tube type 5751
This object is a dual triode packaged in a miniature glass envelope with nine pins. It is a digital-service grade similar to the 12AX7 high-mu twin triode with lower gain.
General Electric Company, USA
||Printed in white ink around the glass envelope.
||Printed vertically in white ink on the glass envelope.
overall: 2 1/8 in x 7/8 in x 7/8 in