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Wide Range Oscillator 200CD early (5 tubes) - Radio Museum
https://www.radiomuseum.org/r/hp_audio_oscillator_200cd.html
Model: Wide Range Oscillator 200CD [early ] - Hewlett-Packard, HP; Palo Alto. Material. Metal case. Shape. Tablemodel, with any shape - general. Dimensions …
Model 200CD wide range oscillator, 1952 | HPE
https://www.hpe.com/us/en/about/history/innovation-gallery/005-product.html
An audio oscillator is an instrument that generates one pure tone or frequency at a time. Through the years, HP oscillators were used to design, produce and maintain telephones, stereos, radios and other audio equipment. The Model 200CD and its sister instrument, the Model 200AB, were introduced at the same time in 1952.
HP 200CD Wide Range Oscillator | Evil Science Audio
https://evilscienceaudio.com/repairs-restorations/hp-200cd-wide-range-oscillator/
The famous Hewlett-Packard 200CD Wide Range Oscillator, in for repair. This one belongs to a local speaker shop, and that fact had a lot to do with the problems found. Lets have a couple more looks inside: Here you can see the power transformer, 6AU6 …
HP 200CD Audio Generator (1955) - antique radio
https://antiqueradio.org/HP200CDAudioGenerator.htm
HP 200CD Audio Generator (1955) the Hewlett-Packard 200CD is a "wide range oscillator" that generates a sine wave in the subsonic, audio, and ultrasonic frequencies (5 Hz to 600 KHz). I bought my HP 200CD for one task: aligning the second IF (intermediate frequency) section of my Hallicrafters SX-88 communications receiver.
HP 200CD - Wide Range Oscillator
http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/Overview/Test_set/Generator_AF_HP%20200CD.pdf
HP 200CD - Wide Range Oscillator . Wide range low-frequency oscillator, covering from 5 Hz to 600 KHz in five ranges: - X1 5 Hz to 60 Hz - X10 50 Hz to 600 Hz - X100 500 Hz to 6 kHz - X1,000 5 kHz to 60 kHz - X10,000 50 kHz to 600 kHz . Dial calibrated to 2%. Output 160 mW (10 volts) into 600 ohm load, 20 volts open circuit. Distorsion less
Wide Range Oscillator 200CD late (4 tubes) - radiomuseum.org
https://www.radiomuseum.org/r/hewlett_pa_audio_oscillator_200cd.html
Model: Wide Range Oscillator 200CD [late ] - Hewlett-Packard, HP; Palo Alto. Material. Metal case. Shape. Tablemodel, with any shape - general. Dimensions (WHD) 7.3 x 11.5 x 14.3 inch / 185 x 292 x 363 mm. Notes. See also Model HP 200CD early with 5 tubes.
Hewlett-Packard HP-200CD audio generator
https://people.ohio.edu/postr/bapix/HP200CD.htm
The Hewlett-Packard HP-200CD audio generator will generate sine waves from 5 Hz to a bit over 600 KHz. That puts its upper ranges right into the broadcast band. It uses a balanced version of the famous light-bulb-stabilized wien bridge oscillator developed by -- you guessed it -- William Hewlett who commercialized it with David Packard.
Hewlett Packard 200CD Audio Oscillator – Learn.org.au
https://www.learn.org.au/ueenee-course-pages-1/ueeneeh142a-oscillators/osc-week-5/hewlett-packard-200cd-audio-oscillator/
Service manual for Hewlett Packard 200CD Audio Oscillator with block diagram of the RC Bridge / Wien Bridge Oscillator, detailed operation and circuit schematic This is a collectible item of test equipment today, beautifully built with it’s ganged variable capacitor and very low distortion output into 600Ω impedance, transformer coupled.
Hewlett-Packard HP-200C audio oscillator - Ohio University
https://people.ohio.edu/postr/bapix/HP200C.htm
Output for the 200C is specified as 100 milliwatts, 10 volts into a 1000 ohm load. Although this is labeled an audio oscillator, and it does indeed cover the full audio spectrum, its upper range is well beyond audio, in the VLF radio range at 200 KHz. Repairs The HP-200C was in rather rough condition and had not been powered for many years.
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