| California Tube Laboratory, Inc. - Electron tube and vacuum tube manufacturer. High power CW and pulse magnetrons, klystrons and power grid tubes. Product listings and data sheets, and outline drawings.
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| Lohmann X-Ray - Manufacturer of industrial and medical X-ray tubes, including tubes for medical, dental, and industrial applications.
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| House of Tubes - Ham radio and audio tubes. Online catalog with secure ordering.
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| Tube World, Inc. - Vacuum tubes and sockets for sale.
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| Electron Tube Data Sheets - Type index, high powered tubes and data sheets in PDF format.
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| Electron Tubes for Industry - Mostly industrial product line.
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| Brand X-ray Tube Co., Inc. - Manufacturer of x-ray tubes for use in medical, dental and industrial imaging and inspection applications.
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| Antique Electronic Supply - Books, transformers, capacitors, and resistors. Has an online catalog and shopping cart.
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| The invention of the vacuum tube - In 1879, the legendary American inventor Thomas Edison publicly exhibited his incandescent electric light bulb for the first time. This led to the invention of the vacuum tube.
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| MachMat main - Vacuum tubes for the audio amp market.
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| Freeland Products, Inc. - Rebuilder of vacuum power grid tubes for industrial, radio and television applications.
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| The Tube Center - Providing HAM and amateur radio operators, antique radio enthusiasts, audio professionals and hobbyists the ability to choose from an inventory over 2000 different tube types.
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| 20000 NOS Electron Tubes - NOS and used tubes, rare valves, virtual museum.
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| TubeTronic - Vintage Vacuum Tubes and Test Equipment. Audio tubes, TV tubes, Radio tubes and Electron tubes. 12ax7, 12au7, 12at7, Generators, Analyzers, and Counters.
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| Kennetron, Inc - Offering rebuilt vacuum, oscillator, induction and transmitter tubes.
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| Mike's Electric Stuff - Vintage electronics, valves/tubes, lamps, geissler tubes, historic display devices, High voltage, tesla coils & misc. other science stuff.
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| Yueqing Zhengli Rectifier Corp. - Tube rectifiers. Site in English and Chinese.
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| Vacuum Tube Valley - All about vacuum tubes. Tube audio amp kits.
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| Tube database search - From NJ7P great site for tube searches. Very many data sheets and examples, includes application notes for some tube types.
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| Electron Tube Enterprises - Supplier of new and used tubes, specialising in hard to find radio and audio tubes for vintage electronic equipment. Online catalogue, price list and purchasing.
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| Superior X-Ray Tube Company - Manufactures high quality custom-made x-ray tubes for a wide range of applications such as thickness gauging, food inspection, bone densitometry, dental, medical, and baggage inspection.
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| Vacuum tube links - A long list mostly audio stuff. Links to substitution guides, data sheet sites.
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| N9TEW Tube Sales - Vacuum tubes for ham, audio and antique radio purposes.
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| Vacuum Tubes, Inc. - Worldwide sellers of vacuum tubes and electron tubes for audio, radio, and industry
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| Thales Electron Devices - Provides electron tubes for space, telecom, radio and TV broadcast, military , X-ray imaging, science and industry applications. Includes products specifications and application notes. Formerly Thomson Tubes Electroniques.
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| D & C Electronics - World-wide distributor of electron tubes, sockets and magnetrons. Replacement tubes for Perkin Elmer mass spectrometer.
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| Collins Tube Specials - Listing of surplus tubes, searchable database.
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| New Sensor Corporation - Manufacturer and wholesale distributor of vacuum tubes and electronic parts. Sovtek tubes.
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| Michelle Troutman's Electronics Items - NOS and used vacuum tubes; also, service manuals and Sams Photofacts, parts, magazines, books, radios and test equipment.
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| Magnatek X-ray sources - "Integrated X-ray generators". Also prototype x-ray sources. Danish company.
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| Pacific TV Vacuum Tube Sales - Vacuum tubes for radio, audio and amateur use. Over 1,000 types with regular 5 lot sleeve specials. Canadian site.
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| Tom's Tubes - Russian PA tubes. Paypal.
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| Vintage SoundWorks - Service for all makes of vintage tube amplifiers and radios. NOS and new and used vacuum tubes.
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| Daily Electronics Corp. - Electron and vacuum tubes. Industrial, military, broadcast and entertainment applications supplied from inventory. Hard to find and obsolete tubes available.
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| DBtubes.com - New old stock, new bulk and used tested tubes. Canadian site.
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| Tuboselectronicos Chile - Sell and buy electron vacuum tubes in South America.
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| Phamitech International Company Ltd - Exporter of electron tubes, TWT, valves, thyratrons, magnetrons, klystrons, transmitting tubes, heating tubes, vacuum interrupters and X-ray tubes made in China
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| Penta Laboratories - Manufacturer and distributor of electron tubes for broadcast, industrial, marine and avionics applications worldwide.
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