502

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Tektronix 502
1 MHz dual beam differential scope
Tek 502 front

Produced from 1958 to 1973

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The Tektronix 502 is a dual-beam oscilloscope introduced in 1958, followed by the 502A in the early 1960s.

Both beams have differential inputs.

Specifications

When set for maximum sensitivity, the 502A is 100 μV/cm and has a vertical bandwidth of 50 kHz. At lower sensitivity settings the bandwidth increases - at 200 mV/cm the bandwidth is 1 MHz. At 100 mV/cm and 1 kHz, the common-mode rejection ratio of the 502A is 40,000:1.

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Models

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

Internals

There is a transistor-regulated 6.2 VDC 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 -2900 V.

Mod 104 on a 502 provides single sweep lockout.

Later 502A have solid state (include nuvistor) input stage, a 6DJ8 as the deflection amplifier and transistors as amplifiers and cathode followers (only in the newest version).

The 502 uses a single supply for the upper beam and lower beam CRT cathodes. The 502A has separate supplies for the two CRT cathodes. This improvement in the 502A allows slight differences in horizontal CRT sensitivity between the two beams to be canceled out in step 8 of the calibration procedure.

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