7B50

Manuals – Specifications – Links – Pictures

The Tektronix 7B50 is a timebase plug-in for 7000-series scopes, particularly the 7500 series, introduced in 1969. It is specified for triggering up to 100 MHz. Triggering uses tunnel diodes. The sweep is fully discrete, no ICs.

There is also a 7B50A, introduced in 1976. According to Bruce Hofer,

The 7B50A was nothing more than a 7B80 with its fastest calibrated sweep rate limited to 5 nS/div via a modified cam-switch that locked out the 2 fastest settings.

The task of designing the 7B50 was inherited and completed by Murlan Kaufman.

Key Specifications

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X-Y operation

The 7B50 has a dedicated switch to put it in "amplifier mode" for X-Y operation. In this mode, the Trigger Source switch controls the signal source – internal from a vertical plug-in via the trigger path, or external — and the Trigger Coupling switch controls AC vs. DC coupling. In amplifier mode, gain can be varied using an uncalibrated potentiometer.

In the 7B50A, like in the 7B80, X-Y mode was an option (Opt.2).

Pictures

7B50

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  7B50

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  7B50

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  7B50

7B50A

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  7B50A

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  7B50A Opt.2 (X-Y)

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  7B50A bottom

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  7B50A rear

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  7B50A Opt.2 top

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Custom ICs used in the 7B50

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Custom ICs used in the 7B50A

Page	Model	Part nos	Description	Designers	Used in
155-0109-00	M120B	155-0109-00 • 155-0109-01	trigger	Gary Vance	5B25N • 5B31 • 5B40 • 5B42 • 5B44 • 5S14N • 7B50A • 7B53A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P • 7S14 • 7612D • SC502 • SC503 • SC504
155-0126-00	M121	155-0126-00	trigger source selector and P-P auto amplifier	Art Metz	7B50A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P