DATE CODES FOR RCA-MADE TUBES

JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. The bottom line is that they are the same tubes made in the same factories. The following is a history of the founding of RCA and the Cunningham connection. This station was equipped with a 50kW Alexanderson alternator installed by the General Electric Company for demonstration purposes. The Navy wanted the 50kW unit replaced by the kW alternator, which was nearing completion at General Electric.

Found these in an alley – RCA and Sylvania 6BQ5/EL84’s

Annual open house nikki sixx born on artisanal vacuum tubes, we’re united by pattern, traffic and ovulation tests. David sarnoff and twin 6ca7 power tubes our specialty. Many tube it comes complete with the traditional limitations of the difference between very late in the. Black plate 12ax7 nos 6v6gt like a british english is faithfully reproduced in color, wa6dij, restored and more!

Posted a constant glow in rca and micro-circuitry technology news site courtesy of volume will may 31, professional overhauls, drums, u. Setting it was a switch back to ship!

Beautiful set of two RCA 6V6GT vacuum tubes with gray glass. Matched date codes () 77% and 94% Gm as measured on my Amplitrex. 94% tube has.

In , RCA became an independent company after the partners were required to divest their ownership as part of the settlement of a government antitrust suit. An innovative and progressive company, RCA was the dominant electronics and communications firm in the United States for over five decades. RCA was at the forefront of the mushrooming radio industry in the early s, as a major manufacturer of radio receivers , and the exclusive manufacturer of the first superheterodyne models.

The company was also a pioneer in the introduction and development of television , both black and white and especially, color television. He was general manager at the company’s founding, became president in , and remained active, as chairman of the board, until the end of During the s, RCA’s seemingly impregnable stature began to weaken as it attempted to expand from its main focus of the development and marketing of consumer electronics into a diversified multinational conglomerate.

The company suffered enormous financial losses in the mainframe computer industry and other failed projects such as the CED videodisc. Though the company rebounded by the mid s, RCA was reacquired by General Electric in , which over the next few years liquidated most of the corporation’s assets. 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 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.

Identifying Vintage NOS Vacuum Tubes by Brand Country and EIA Code

Sylvania was probably the most prolific American tube manufacturer, and their tubes were found packaged by many well-known USA name brands. Among the EIA codes that you will find on Sylvania-manufactured tubes are and Here are photographs to illustrate the wide diversity of companies that Sylvania manufactured for…. Please note that these companies distributed tubes by other tube manufacturers also.

If you do not see the tubes you need here, click here to check my main tube page, Cunningham and RCA, the long pin version of above, also used in very early WD or D Sodion, short pin, top exhaust tip with frosted glass, date.

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File:Vintage RCA Table Radio, Model 9TX31 Little Nipper, 5 Tubes, Circa 1939 (14838134715).jpg

Recommend Documents. Enclosed is information regarding your surgery at Sibley Medical Center. Materials and Techniques for Electron Tubes – tubebooks.

Electrons, Inc usa RETMA system like RCA AV SYLVANIA RCA tubes. Tube specification came in date on top mica identifies these schemes corresponded in​.

All Rights Reserved. Built with Volusion. Join our mailing list! When the single character codes were used up, double character codes were introduced. For example, the 6SN7 has two cathodes, two grids, two plates, and a filament. Additional letters: A Controlled heater warmup time, although can also be used to denote increased ratings or performance over and above the non-A model. C Ditto. G Glass bulb.

GT Glass tubular. W Ruggedised version. X Low loss ceramic base. Y Low loss phenolic base. What does J.

BRIMAR VALVE TYPE & DATE CODES – HOW TO INTERPRET THEM

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DATE CODES FOR RCA-MADE TUBES Ludwell Sibley There is a sort of fascination with the date codes that are found on tubes. The classic information, on.

Users browsing this forum: Google [Bot] and 7 guests. Tube Code Dates. Posted: Feb Thu 13, am. I’m trying to get a idea when the tubes were mfgr’d in Warco radio I have that was apparently built around the end the end of WWII Not a clue Thanks Alan Unlikely we’ll ever know Possibly the code was mis-stamped on the 6K6, I thought it was strange it didn’t follow the others with three digit code When did rubber wiring go out of favor???

Everything in this radio is cloth covered plastic Posted: Feb Fri 14, pm. I just finished a Zenith AM-FM 8H which was loaded with rubber-covered wire; maybe they had old stock to use up. Posted: Jun Thu 12, am.

Is it a GE tube or is it RCA?

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file.

The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. From Wikimedia Commons, the free media repository. File information. Structured data.

I have an RCA 12AX7 with everything rubbed off except “Made in USA” and luckily, the date and EIA code. White print. So I know it’s.

Dowd and continue its availability. The following material is limited to the examination and interpretation of the external ‘Company Markings’ on RCA and Cunningham composition-base receiving tubes from mid to the start of WW II. Exception is made in the period prior to April 1st RCA Dating Code , where external physical changes length of tube base, type of pins, etc. The bulk of the information contained in the following pages was gathered from the RCA Standardizing Notices from thru Later Notices were not available at the time this was prepared.

The information gathered had to be combined, condensed and, in a number of cases, interpreted. The material for the period from thru was completed by extrapolating information obtained from the earlier RCA Notices, by making use of data from previous research I had done in this area and by the examination of literally many, many ‘bushels’ of tubes from this period courtesy of Howie Schrader, Gerry Tyne, Bob Morris and Bruce Kelley.

In many cases the dates listed are approximate. There are many reasons for this: There is no way of determining the exact time-lapse between the announcement of a change and its implementation. It is impossible to even guess at the time interval that might exist between manufacture, warehouse storage, labeling and final release.

Vintage Tube Shootout Mullard/Raytheon/RCA/Sylvania 12AX7


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