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+[[File:Tek_191_front.jpg|350px|thumb|right|Tektronix 191]]
 The '''Tektronix Type 191 Constant Amplitude Signal Generator''' is a sine wave source
-[[introduced in 1966]].  It covers frequencies from 350 kHz to 100 MHz in seven bands.  The output
+[[introduced in 1966]].
-amplitude can be adjusted in calibrated steps from 5 mV to 5 V in three ranges.  The oscillator
-is an 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.
+{{MissingSpecs}}
+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.
+==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.
+==Manuals==
 * [http://w140.com/mmm/tek-191.pdf Tektronix 191 Manual (PDF)]
+* [[Media:TB-9-6625-2176-35.pdf|TB-9-6625-2176-35 - 191 calibration]]
+==Pictures==
 <gallery>
-Image:Tek_191_front.jpg|Front view
+File:Tek_191_front.jpg|Front view
-Image:Tek_191_top.jpg|Top internal view
+File:Tek_191_top.jpg|Top internal view
-Image:Tek_191_bottom.jpg|Bottom internal view
+File:Tek_191_bottom.jpg|Bottom internal view
-Image:Tek_191_left.jpg|Left internal view
+File:Tek_191_left.jpg|Left internal view
-Image:Tek_191_right.jpg|Right internal view
+File:Tek_191_right.jpg|Right internal view
-Image:Tek_191_rear.jpg|Rear view
+File:Tek_191_rear.jpg|Rear view
-Image:191.png|Schematic
+File:191.png|Schematic
 </gallery>
 [[Category:Signal generators]]
 [[Category:Introduced in 1966]]