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Tektronix 7B50A
100 MHz timebase
7B50A front

Compatible with 7000-series scopes

Produced from 1976 to 1988

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 7B50A is a redesign of the 100 MHz 7B50 timebase plug-in for 7000-series scopes, 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 two fastest settings.

Key Specifications

Sweep 50 ns/Div to 5 s/Div (1–2–5), ×10 magnifier (down to 5 ns/Div), variable sweep (up to ×2.5) and holdoff (up to ×2 sweep lengths at 20 ms/Div and faster)
Excluded sweep First 10 ns in 78xx, 79xx; First 20 ns in 77xx; First 50 ns in other mainframes
Trigger 50 mV or 0.3 Div up to 50 MHz, 250 mV or 1.5 Div up to 150 MHz; AC >30 Hz, LF REJ >30 kHz, HF REJ <50 kHz
Jitter <500 ps at 150 MHz
Ext. Trigger Max. 250 V DC+peak AC, 1 MΩ // 20 pF
Sweep/Trigger Modes Peak-Peak Auto, Auto, Norm, Single Sweep

X-Y operation

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


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