The TD202  (P/N 152-0155-00) is a 2.2 mA, 25 pF tunnel diode.

Some instruments using part TD202

Instrument Manufacturer Class Model Description Introduced
546 Tektronix Oscilloscope 546 50 MHz oscilloscope 1964
547 Tektronix Oscilloscope 547 50 MHz oscilloscope 1964