502

The 502 is a dual-beam oscilloscope introduced in 1958, followed by the 502A in the early 1960's. Both beams have differential inputs. When set for maximum sensitivity, the 502A is 100 microvolts/cm and has a vertical bandwidth of 50 kHz. At lower sensitivity settings the bandwidth increases. At 200 mV/cm the bandwidth is 1MHz. At 100 mV/cm and 1 kHz, the common-mode rejection ratio of the 502A is 40,000:1.

Image magnified out from a flyer

There is a transistor-regulated 6.2V DC heater supply for the tubes in the first stage differential amplifier. This heater supply uses the -150 V supply as its reference. The -150 V supply uses a 5651 voltage reference tube as its reference. There is no post-deflection acceleration. The CRT cathode voltage is -2900V.

There is a 502, a 502A, and a rack-mount model, the RM502A. The price of the 502 in July 1959 was $825.

Mod 104 on a 502 provides single sweep lockout.

Later 502A have solid state (include nuvistor) input stage. 6DJ8 as deflection-amplifier and transistor as amplifier and cathode follower ( only by latest version).

• Tektronix 502 Manual (PDF)
• Tektronix 502A Manual (PDF)

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  502 front view

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  502A block diagram

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  502A vertical amplifier

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  502A CRT circuit

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  RM 502A

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  RM 502A display

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  RM 502A bottom

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  RM 502A transformer wiring

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  RM 502A top

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  RM 502A vibration-isolated vertical amp

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  502 left

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  502 right

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  502 bottom

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  Solid State Inputstage with two 6DJ*

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  502A