A Thomas Sams Photofact publication, first edition, first printing This book explains the uses of Lasers and Masers and their applications. Masers in their fundamental action are completely different then vacuum tubes or transistors, while electronics abound with many new techniques and applications, most of these are modifications of pre-existing knowledge and do not represent revolutionary ideas. The Maser is an entirely new concept. Noise-Free amplifiers and ultra-stable signal sources are just two Maser applications. A special type of Maser, called the Laser, is a light amplifier and source of coherent light; it is a spectacular by product and the first ever produced by man.
UDPATED (4): Presto Recording Corp: Pioneers of ‘Instant’ Analog Disc Recording
Quantity In Stock — Quantity in Stock new listing categories: Please call us for the latest inventory, and we can often outsource these tubes for you. New Old Stock White Box. Great blackplate Sylvania and Westinghouse GTB tubes screened for demanding use in electronic organs. All have passed the Baldwin factory test for audio use!
Back to Sam’s Laser FAQ Table of Contents.; Back to HeNe Laser Testing, Adjustment, Repair Sub-Table of Contents. HeNe Problems and Testing How Can I Tell if My Tube is Good? A variety of faults can result in a HeNe tube not working properly.
The History of Wireless: Either audibly or by radio – DX will be!! DX is an early telephone term for distant exchange. The term DX appears in many math formulas as distance of x. See Origin of DX. At any rate, for Amateur Radio, it is the sending of messages over long distances. They noticed that when an amber was rubbed with other materials it became charged with an unknown force that had the power to attract objects such as dried leaves, feathers, bits of cloth, or other lightweight materials.
RCA Electron Tube
Some DCC locomotives feature on-board sound effects. A layout can be divided into blocks powered separately. Locomotives located by the power they use. Legendary railroad services, past and present.
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The region’s dense social networks and open labor market encourage entrepreneurship and experimentation. Companies compete intensely while learning from one another about changing markets and technologies through informal communication and collaboration. In a network-based system, the organizational boundaries within companies are porous, as are the boundaries between companies themselves and between companies and local institutions such as trade associations and universities.
The Route region is dominated by a small number of relatively vertically integrated corporations. Its industrial system is based on independent companies that keep largely to themselves. Secrecy and corporate loyalty govern relations between companies and their customers, suppliers, and competitors, reinforcing a regional culture that encourages stability and self-reliance. Corporate hierarchies ensure that authority remains centralized, and information tends to flow vertically.
The boundaries between and within companies, and between companies and local institutions, thus remain distinct in the independent-company-based system. The performance of Silicon Valley and Route in the past few decades provides insights into regional sources of competitiveness. Far from being isolated from what’s outside them, companies are embedded in a social and institutional setting — an industrial system — that shapes, and is shaped by, their strategies and structures.
Understanding regional economies as industrial systems rather than as clusters of producers, and thinking of Silicon Valley and Route as examples of the two models of industrial systems — the regional-network-based system and the independent-company-based system — illuminate the different fates of the two economies Geography probably played as critical role in this rate as the informal social contacts.
The spatial concentration of a large number of technology-based firms enabled people to change employers without altering other aspects of their lives.
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Finding technicians with the skill to repair old radios can be a daunting task. I cannot personally attest to the competency of these folks, so it’s up to you to determine whether you trust any of them with your “baby. Also repair antique, table-top model radios. Alabama Historical Radio Society alabamahistoricalradiosociety.
Berliner Gramophone: Berliner, Emil: An improved version of the Gramophone, a talking machine invented by Emil Berliner () in , and made since using a patented hard rubber disc, was introduced by Berliner’s US Gramophone Company.
Vintage radio parts and service restoration of antique radio and other vintage electronics from ‘s to ‘s. Over 2, , parts in stock. Located in southern Illinois. In business since Call or Email: We specialize in consumer and professional audio repair. We repair reel-to-reel units and vintage radios. Located at Harford Road Baltimore, Maryland Also tape recorders, reel to reel decks, turntables.
Phone connector (audio)
Above, the Presto Model A, their top-of-the-line system circa There is a detailed history of the Presto Corp provided at this website, so no need to re-tread those waters. Basically, what Presto offered was a way to make good-sounding LP and 78 recordings that could be played back instantly on any home turntable. Unlike earlier commercial recording technologies, there was no intermediate submaster required. Presto was able to do this by having designed an aluminum later, glass disc that was coated with a special cellulose-based compound featuring 51 ingredients!
Apr 03, · RCA ‘s are good tubes and worth a bit. is just the US designation for 12AX7. It’s possible those are the original tubes from ’65 too. I usually go to and compare my tubes to pictures of the tubes there to determine exactly what I have.
Quantity In Stock — Quantity in Stock new listing categories: Please call us for the latest inventory, and we can often outsource these tubes for you. New Old Stock White Box. Great blackplate Sylvania and Westinghouse GTB tubes screened for demanding use in electronic organs. All have passed the Baldwin factory test for audio use! This is the famous black plate s s version 6SN7 and is in great demand today. Medium glass envelope, marked with the Sylvania green label, the Baldwin label, or the Westinghouse label, but all came from Baldwin.
Organ tubes are especially fine sounding in audio equipment, and we have carefully matched these into pairs and also have singles available. Of particular interest was the Baldwin Organ 6SN7 which to my ears in both a B and 45 SE was as clean as others costing many times more. Click on screen at left. New Old Stock, white box. This is a very good, very rare dual triode.
Among the best ever made of the 6SN7 dual triode type tubes. This has the Mullard label on the short coke bottle glass, and the brown micanol base.
Establishment by General Electric[ edit ] Company logo in stressed its leadership in international communication. In , the Wireless Telegraph and Signal Company, Limited, was founded in London to promote the radio then known as “wireless telegraphy” inventions of Guglielmo Marconi. As part of a worldwide expansion, in American Marconi was organized as a subsidiary company, holding the rights to use the Marconi patents in the United States and Cuba. With the entry of the United States into World War One in April , the government took over most civilian radio stations, to use them for the war effort.
Although the overall U. Defying instructions to the contrary, the Navy began purchasing large numbers of stations outright.
Purchased from a long-time business that was closing its doors both tubes tested good a great chance to get 2 vintage RCA tubes selling with no Reserve Seller assumes all responsibility for this date: Nov 18,
From to , Abbotwares of Los Angeles produced ten different varieties of an Art Deco, horse-themed radio. They are quite rare and very hard to find in such pristine condition. It still has the original patina, dark brown and copper just like the factory produced them. So many of these radios have had the patina polished away, missing the reins or the saddle.
Blake has replaced all of the paper capacitors, tested and replaced bad resistors and checked all of the tubes. He performed a proper alignment, making this little five-tube, AM only radio play like new. A very cool gift for that horse lover, or man cave. Here is another one of a kind radio design! This Abbotwares “Horse with Saddle” is seldom seen, and when found is usually missing its saddle. It came from the estate of a Doctor in Auburn, Maine, who collected only the best of each radio.
RCA 2 letter date codes cleaned up a bit
Pilot Electric Manufacturing Company also claimed to be “The World’s Largest Radio Parts Plant” in the twenties and they did build all of the parts supplied with their kits. Though not the first Shortwave receiver kit offered by Pilot, the three-tube “Wasp” was certainly their first really popular Shortwave receiver kit.
The plug-in coils selected the tuning ranges that covered meters to 17 meters or about kc up to
Sylvania was a major manufacturer of Military tubes and selected a 3 digit lettering system to designate Sylvania products. One system prefixes a three-digit number .
Quantity In Stock — Quantity in Stock new listing categories: Please call us for the latest inventory, and we can often outsource these tubes for you. New Old Stock original box and White Box. High demand tube, getting hard to find. These rival the West Europe types, making them a real bargain now, while they last!
These are the original and preferred tube for the phase inverter in most Fender amps. Super low noise and accuracy makes it a top pick for microphones and recording equipment. The tube of choice for classical, jazz, male vocals, and choral music. Perfect labels, very nice tubes.