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The 5AR4  (European: GZ34) (P/N 154-0168-00) is a dual rectifier vacuum tube with an Octal base. It is used in the 502 and 160.

Some instruments using part 5AR4

Instrument Manufacturer Class Model Description Introduced
160 Tektronix Oscilloscope 160 Modular Oscilloscope 1952
502 Tektronix Oscilloscope 502 1 MHz dual beam differential scope 1958
502A Tektronix Oscilloscope 502A 1 MHz dual beam differential scope 1963