152-0177-00
The Tektronix 152-0177-00 (P/N 152-0177-00, 152-0177-01, 152-0177-02) is a 10 mA germanium tunnel diode with 4.7 pF maximum capacitance in a DO-17 package.
It is used in the 7S14/5S14N and the 7T11A. Subsequent versions (generally with better specs) were the 152-0177-01 and 152-0177-02.