Users browsing this forum: devilsmist, Google [Bot] and 6 guests. RCA octagon break date codes. Posted: Sep Fri 02, am. Out of curiosity, I would like to decode the octagon coded dates on these two tubes. Both have breaks in different locations of the upper right corner. One seems to have a break in the top of the right side line and the other seems to not have any breaks in the side lines. Both seem to also have a dot printed to the right and above the “5”. I have been searching the internet for the decoding information of this RCA dating system with little success.
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.
NOS (2) PAIR type 45 TUBES RCA / KEN-RAD ( ) Tube TV-7 Matched Quad RCA A Vacuum Tubes: Same Date Code (DY.
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”.
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In fact, most of the RCA B tubes were “cross branded” with the A tubes for the military changed from the “plain” the “date code” which is printed.
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.
Notice that Sylvania Chrome-Top tubes will always have a code adjacent to the tube-type. The code consists of three characters, usually but not always in a Letter-Number-Letter sequence.
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
Found a cache of various NOS tubes I’ll be listing: Single RCA 12AX7 long black plate with square getter. Date code NOS test new.
Log in or Sign up. Messages: 1, Location: NYC. Is there a difference? Same tubes? Steve O , Oct 30, The process of installing a new tube and putting the old one in the box to keep as an emergency spare was quite usual in the tube era, unfortunately for you. If the ones you just bought work fine, that’s good, otherwise you just paid for learning. Good luck. Tinkerbelle , Oct 30, Thanks all! What I’m hoping to do it replace the non original tubes in my MX with what would be best.
Also I’ve experienced that some tubes test well but sound for shit. Messages: 2, Location: New England.
Recommend Documents. Enclosed is information regarding your surgery at Sibley Medical Center. Materials and Techniques for Electron Tubes – tubebooks. Halloysite Tubes as Nanocontainers for
True NOS NIB Date Matched Pair RCA USA 6SC7 Metal Vacuum Tubes %. EUR 62, spedizione: + EUR 4,44 spedizione. True NIB NOS Date Matched.
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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.
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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.
DATING THE RCA (CUNNINGHAM) COMPOSITION- BASE RADIO RECEIVING TUBES FROM MID THRU (START OF WW II) Brother Patrick Dowd.
It is a long page, use your scroll button and scroll down the page to see it all. This list is antique types only. I will make every attempt to keep this up to date, but if you need a quantity of any of these tubes, please e-mail me. I can give you an up to the minute stock check. These tubes have been out of production for decades, and supplies are usually poor.
If I have the original box, I will supply it, but many have not survived the years. I have the brands on hand listed, but stocks of each brand are very limited. If you need one certain brand only, please specify that in your order, or e-mail me first about availability. The tubes are tested as NOS and guaranteed 30 days, but due to their extreme age, I cannot know if some have been operated before. If you do not see the tubes you need here, click here to check my main tube page, or e-mail me.
I have both “G”, “GT”, “S”, and metal styles of many early tube types. For orders within the USA, please click here for a handy online order form.