Probably the most used tube of all times in the final amplifier of “boat anchor” transmitters is the From the early s until at least the s, the found its way into virtually every manufacturer’s line of transmitters. In fact, during the early s RCA had a series of advertisements on the back cover of QST that listed a different manufacturer’s equipment that used the each month. There are actually three distinctive variants of the basic The , A, and B. It is unfortunate that the B was called the B for it is really a different tube from the first two. Primarily the difference between the “plain” and the A is the makeup of the heater “filament”. The A has what RCA calls the “dark heater”. This “dark heater” is supposed to be more resilient to vibration, work well at a larger “range” of voltage, etc. Otherwise, the and the A are the same tube.
File:Vintage RCA Table Radio, Model 9TX31 Little Nipper, 5 Tubes, Circa 1939 (14838134715).jpg
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DATING THE RCA (CUNNINGHAM) COMPOSITION- BASE RADIO RECEIVING TUBES FROM MID THRU (START OF WW II) Brother Patrick Dowd.
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.
Rca date of manufacture.
Always checked for shorts, leaks, gas and Gm, Emissions or Plate Current where applicable. Visit our store to view our inventory of thousands of tubes. We have a retail location located in Easthampton MA. You are more than welcome to pickup your order in person. Combined Shipping. We combine shipping but with a few caveats.
Customers often say to me things like “I want RCA brand tubes, but not On this same date, a cross-licensing agreement was affected between RCA and GE.
The vacuum tube business was a very incestuous one, so much so that you can rarely trust everything that is printed on a tube. Often, the printed brand or printed country is incorrect. Vacuum tubes were simply a commodity that everyone needed like batteries or light bulbs are today. For the most part, back then no one cared when a tube was made or who made it, they just wanted a good product that would work and bring their radio, amplifier or TV back to life.
Which is part of the reason it can be so hard to figure out today. There were a few different reasons a given company would re-brand or write the wrong country of origin on a tube. They ran out of stock of one particular type and contracted another company to make them to fulfill an order. This is why you see even major brands like Sylvania with RCA date codes. If they could source the tubes cheaper than they could manufacture them.
Ironically, European tubes like Telefunken and Mullard were seen as inferior to US tubes at the time as they were cheaper and many tubes you will see an RCA labeled tube that was really produced by Telefunken.
Date Matched Pair RCA USA 6SJ7 Metal Vacuum Tubes 91% & 91%
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The RCA Corporation was a major American electronics company, which was founded as the By , RCA had completely switched from tubes to solid-state devices in In , RCA Global Communications Inc., a division with roots dating back to RCA’s founding, was sold to the MCI Communications Corporation.
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Is it a GE tube or is it RCA?
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!
Oct 20, – 2 Matching Date RCA 6AG7 Vacuum Tubes NOS #Vintage.
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DATE CODES FOR RCA-MADE TUBES
This page brochure goes into necessarily exhaustive detail on prewar product. Bits of other “dating data” have surfaced in the radiocollector press and are available in, for example, Tube Lore. Before going farther, it is appropriate to point out that there were actually three ver- sions of date CODES : k date of manufacture. This was the point of production at fhefactory.
Tube Type / Number: 6SJ7 Actual Brand*: RCA Printed Brand: RCA Radiotron & RCA Victor Quantity of Tubes: Date Matched Pair Plate Construction: Getter.
Livraison gratuite. Always checked for shorts, leaks, gas and Gm, Emissions or Plate Current where applicable. Visit our store to view our inventory of thousands of tubes. We have a retail location located in Easthampton MA. You are more than welcome to pickup your order in person. Combined Shipping. We combine shipping but with a few caveats. With free shipping, we cannot combine shipping. To correctly combine shipments you must either use the add to cart feature or request total from seller feature.
If you create multiple transactions or use checkout multiple times and over-pay for shipping, we will not automatically refund you. If this happens it is fully on you to let us know that you were overcharged and we will manually refund you less the fees we were charged on the over-payment. See eBay’s shipping section for our rates. Typical transit times. We do not accept returns on the subjective basis of sonic qualities.