Hp 200c Audio Oscillator

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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.

HP 200c Manual - www. hparchive

http://hparchive.com/Manuals/HP-200C-Manual-sn-50000.pdf

Circuit Description -- The Model 200C AudIo Oscillator consists of an oscillator section, an amplifier section and a power supply_ The oscillator sectIon (tubes V 1 and V2) is a reslstance-tu ed type circuit. Basically, thIS oSClllator IS atwo~stage resista ce -coupledampliher which is caused to oscillate by the use of a posItIve feedback network.

Audio Oscillator 200C Equipment Hewlett-Packard, HP;

https://www.radiomuseum.org/r/hewlett_pa_audio_oscillator_200c.html

HP-200C audio oscillator, Serial Number A6940 Click on the schematic thumbnail to request the schematic as a free document. Technical Specifications Number of Tubes 5 Valves / Tubes 6J7 6F6 6J7 6V6 5Y3GT Wave bands - without Power type and voltage Alternating Current supply (AC) / 115V Volt Loudspeaker - For headphones or amp. Material Metal case

Early Audio Oscillators - HP Memory Project

http://www.hpmemoryproject.org/wa_pages/wall_a_page_01.htm

The dial calibration of Models 200A, 200B and 200C covers approximately 180 degrees, with an equivalent scale length of about 60 inches. Under normal conditions the frequency drift is less than +/- 2 % including initial warm-up. No zero setting is necessary on these oscillators. The HP 200i tuning dial as shown in the 1945 catalog No 18A

HP 200 Series - HP Memory Project

http://hpmemoryproject.org/timeline/bob_devries/hp200c_01.htm

The HP 200C quoted by Bob DeVries, was an evolution of the basic HP 200A/B Audio Oscillator which was itself the first measuring instrument manufactured by Hewlett Packard in 1939. At the origin, this very first audio oscillator prototype was built by Bill Hewlett for his Stanford University thesis project in 1938.

hewlett-pa: The HP 200 Audio Oscillators Series

https://www.radiomuseum.org/forum/hewlett_pa_the_hp_200_audio_oscillators_series.html

200B AND 200C Here is the main tuning dial of -hp- Models 200B and 200C Audio Oscillators. Range is 20 cps to 20 kc on 200B, with dial calibrated over approximately 180° and effective scale length of about 20"; 200C has range of 20 cps to 200 kc and effective scale length of about 26".

https://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv013.cgi?read=35195

HP 200C Audio Oscillator Message #1 Posted by Joe McGerald on 1 June 2003, 1:15 p.m. I acquired one of these today from the earliest days of Hewlett Packard. It seems to be complete and in relatively good shape. Does anyone have an estimate of the value and/or know where I might be able to find information about it.

HP 200C Audio Oscillator Restoration Help - Antique Radios

https://www.antiqueradios.com/forums/viewtopic.php?t=345344

HP 200C Audio Oscillator Restoration Help. Hello everyone. One of the projects I thought I would undertake next is this HP Model 200C Audio Oscillator. This unit was picked out of a storage house where it had been sitting for years in very cold winters and hot summers (just like the rest of them). Overall, the unit doesn’t look to complicated ...

HP 200CD Wide Range Oscillator | Evil Science Audio

https://evilscienceaudio.com/repairs-restorations/hp-200cd-wide-range-oscillator/

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 sockets, and stabilizing lamp sockets.

Audio Oscillator Project - Hp 200c Restoration | All About ...

https://forum.allaboutcircuits.com/threads/audio-oscillator-project-hp-200c-restoration.26851/

Audio Oscillator Project - Hp 200c Restoration. Thread starter Mckayman; Start date Aug 20, 2009; Search Forums; New Posts; 1; 2; Next. 1 of 2 Go to page. Go. Next Last. M. Thread Starter. Mckayman. Joined Jun 22, 2009 50. Aug 20, 2009 #1 Okay well I just got my hands on a Hp 200c from the dawn of the 50s! My goal is to restore it in to working ...

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