Dating rca vacuum tubes

But with your help, we’ll continue to update and keep the data fresh, relevant, and complete.Try out Family Feud on Facebook and use a little help from any of the charts below (see links in the tabs for 3, 4, and 5 answer Family Feud for Facebook game data).Remember, this code element follows the tube type code and the change code, which are always the first two codes in the code sequence. This code is really only necessary if the factory label becomes rubbed off of the tube, so you can tell what tube you have. Most audiophiles are concerned with date codes and, to a lesser extent, the factory code.

The year and month started to be used at this point after 1956, so the change code is not really necessary in newer tubes to pinpoint a manufacture date.Some documents and other sources I have researched indicate this week code was only added from 1961 onwards.It also does not mean that all tubes made since 1961 have the week code.Use the charts below to see if the week codes even apply to your tube..... For the most part, on tubes commonly found in circulation today, the code is located on the side of the glass in dark grey paint, down low just above the bottom.It follows this convention before 1956: Where TT stands for the one, two, or three symbol tube type code, C is the change code, F is the factory and/or country code, and M is the month of manufacture.

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