7B50
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 |