M

Manuals – Specifications – Links – Pictures

The Tektronix Type M is a four-channel plug-in for 500-series scopes. It was designed by Oz Svehaug and Glenn Parks. Early versions had UHF connectors for the inputs. Later versions have BNC connectors for the inputs.

Type M was introduced in 1962, along with the Type O, and dropped after 1972.

Key Specifications

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The risetime is 17 nanoseconds, bandwidth is DC to 20 MHz. Maximum sensitivity is 20 mV/div. Each channel can be AC or DC coupled, inverted or straight, or disabled entirely. The enabled channels can operate in CHOP or ALT mode.

Internals

Each input goes through a step attenuator, is clamped by a neon bulb, and then is fed to the grid of a cathode follower made with a 7586 Nuvistor tube. Next, the signal goes to a PNP differential amplifier. Diodes in series with the collector signal of this differential amplifier are used for input channel switching. An internal differential signal bus connects the switched outputs of each of the input channels and feeds the signal to the output amplifier, which drives pins 1 and 3 of the 500-series plug-in connector. The output amplifier is two 12AU6 pentodes connected as a differential amplifier, followed by a 12AT7 dual triode acting as a cathode follower to drive the output with a relatively low impedance.

Pictures

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  Late Type M Front view.

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  Late Type M Left view.

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  Late Type M Right view

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  Early Type M Front

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  Early Type M Left

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  Early Type M Right

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  Type M Mod 210D

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  Channel Switching Schematic, sn 824 and below

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  Channel Switching Schematic, sn 825 and above

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  Four Channel Switched Amplifier Schematic, sn 2759 and below

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  Four Channel Switched Amplifier Schematic, sn 2760 and above

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  Type M in 556