191
The Tektronix Type 191 Constant Amplitude Signal Generator is a sine wave source introduced in 1966.
Key Specifications
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The 191 covers frequencies from 350 kHz to 100 MHz in seven bands. The output amplitude can be adjusted in calibrated steps from 5 mV to 5 V in three ranges.
Links
Documents Referencing 191
| Document | Class | Title | Authors | Year | Links |
|---|---|---|---|---|---|
| Tekscope 1970 V2 N3 Jun 1970.pdf | Article | Tektronix Signal Sources | 1970 | 2101 • 2901 • 114 • 115 • R116 • 106 • 191 • 284 • 140 |
Internals
The oscillator is a Colpitts oscillator using a 7119 tube.
A peak-to-peak detector made with two GaAs diodes measures the swing of the oscillator and produces a DC feedback signal that controls a series voltage regulator that supplies power to the oscillator.
The calibration procedure in the manual makes use of a 661 to accurately view the output waveform.
Pictures
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Front view
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Top internal view
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Bottom internal view
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Left internal view
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Right internal view
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Rear view
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Schematic
