The 0A2  (European: 150C2) (P/N 154-0001-00) is a 150 V voltage reference tube with a miniature B7G 7-pin base. It is used in the 130.

0A2 VR Tube

Note: The designation is 0A2, the leading zero indicating a tube without a heater, although this is often mis-printed as OA2.

Some instruments using part 0A2

Instrument Manufacturer Class Model Description Introduced
110 Tektronix Pulse generator 110 Pulse generator/Trigger 1960
130 Tektronix Multimeter 130 L/C Meter 1959
Keithley 610 Keithley Multimeter 610 Electrometer 1960

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