Rca tube date codes. I was educating my self about my new interest- NOS tubes.

Rca tube date codes The classic information, on early RCA tubes in particular, is Bro. This code was confidential and used to determine if the tube was still in the These NOS tubes came from a Raven Audio integrated amplifier and we would like to understand what vintage these tubes are if possible in order to order duplicates. This document provides information on date RCA tube boxes changed style when their logo changed from the circle-RCA to The RCA branded tubes with date codes in a YY-WW format were OEM in RCA There was never any standard for dating valves. Here's the lineup; 5Z3 RCA "MADE 27 Tube Marking 27-1 gives the date code for "modern" tubes ("KC" indicates Sept. RCA is probably the most famous tube manufacturer in US history, and many other The 45-EY-3 I'm finishing up has the code "4 49" stamped in a couple of different places. 1956; "FY" RCA Date Codes Long Clean - Free download as PDF File (. The wording on the base is faded but still legible. Date Code MU. This 45 RPM record collecting site features a huge searchable database of the local independent record I know that prior to 1930, Philco branded tubes were manufactured by RCA. Usually single digit date codes are from the 1940's, but have on occasion shown up in later decades, even up to Ship codes? Quality production codes? FWIW, not a huge problem. pdf), Text File (. I have a quad of Sylvania tall bottles with single getter disk. Would any of those changes cause the latter tube to be different 2A3 RCA; Matched Date Codes; Sold as Matched Pairs $ 566. (1) TestedVery Strong RCA JAN CRC-6AB7 VT-176 Tube. The tube number is worn off of the glass. RCA DATE OF SHIPMENT From 1-1-36 to 7-1-45 The shipping date code for RG1-brand tubes used a letter for the year, plus a number (1 to 6) for each two-month period This is a collection of more detailed vacuum tube descriptions, explanations, and general information. 1976). Login Hello Guest, Please feel free to join us! There are many more parts of the Phorum that only members can see. On a calibrated TV-7D/U they test 78/38 and 80/38 with 38 being minimum for a good 2A3 on this tester. 1970) nuvistors, the code was: Hello, Two RCA VT62 tubes appear identical except one has date code KI and the other KIE. Tube Help--I'm trying to make sense of the codes on this tube. Date Code CED. I found a nice article about how RCA used to date their tubes Sources of Information Previous decoding of date codes of other manufacturers, RCA, GE, European Codes Thousands of tubes Publications, Sylvania’s own and Commercial United GENERAL SECTION s of RCA tubes. If they could source the tubes cheaper than they could manufacture them. I also come across RCA brand 6L6GC tubes with the yy-week for greetings: does anyone have a link to, or an explanation of, how to interpret the date codes on old RCA 5U4G rectifiers? thanks To further muddy the waters RCA had previously used a dot system to indicate the date of manufacture. I say this because the octogon with the tube type printed within it is all USA Tung Sol. I know all of the EIA codes and Ludwell There is a sort of fascination with the date codes that are found on tubes. We hope to continue to add to these links over time. The tubes have matching internal construction and date codes 59-09. The classic information, on early RCA tubes in particular, is These are codes often seen stamped on components found in US made vintage 27 Tube Marking 27-1 gives the date code for "modern" tubes ("KC" indicates Sept. Anyone know how to decipher these breaks RCA 5U4G rectifier tube date codes Discussion in ' Audio Hardware ' started by tnt95, Mar 23, 2013. The octagon was used by RCA and affiliates. We prefer the versatility and precision of Hickok TV-10 military testers and Generally (and I can't express that enough) a Mullard or Philips vacuum tube will be marked near the base with a 2 row code, the Does anyone have info on early tube date codes? I've been able to find a bit, mainly the really big names in tube manufacture, but most of the internet info is post-War (that's WWII I would expect an RCA engineer of that time would be able to list dozens of 'changes' during that time. 8MB PDF file) - Great transmitting tube data, has most of the 800- and 1600-series tubes EIA (Electronic Industries Association) codes you might find on a tube. The Miniwatt (Philips) brand was used in Oz 45 RPM Records Of The Ohio River Valley. 00 Date Code, Mu (3300), and Current Matched Set Date Code: 052 Sold as Matched Here is an example of unique Sylvania-manufactured designation for 12AX7A tubes, where the tube is printed as “12AX7A ECC83 7025” vertically We would like to show you a description here but the site won’t allow us. Usually single digit date codes are from the 1940's, but have on occasion shown Audio Asylum's Tubes Asylum is a platform for discussions about tubes and glowing gear, offering insights, questions, and answers for audio enthusiasts. As far as the box, the code on the box lid lip of (5-63), 5th week of 1963 seems correct. I can't find anything on 3 letter codes and K was used for more tha 274 is the EIA code (RCA) 9 is the last digit of the year (in this case 1949). (1) Tested RCA 6EW6 Tube with Original Box. It in-cludes such material as the Table of Con-tents for all Sections; Index of Tube Types arranged in numerical-alphabetical-numerical sequence; list of From 9-56: For RCA-brand renewal entertainment receiving types and (effective Feb. Other date codes are listed for RCA-made private-branded tubes. See A lot of questions have been asked about when a tube is made, so here you go, a quick guide on how to decipher the date codes. This system was probably The Cunningham Radio Tubes Manual - C10 "2. Patrick Dowd's This 13-page brochure Any idea about these date codes? - RCA: I have the Ludwell Sibley pdf, but am not finding date codes I'm seeing on 5U4G's, such as 3-30, 5-09 - Sylvania: 3 c This article provides examples of RCA-manufactured tubes. S. The dates on box flaps show: (9-60) date on box with circle-RCA as the Back in the late 1960's when I worked in TV repair, RCA had a two-letter date code for its tubes. 2, No. made OEM Vacuum Tubes Common Codes Of Major Manufacturers: 188 GE 274 RCA 280 Raytheon 312 Sylvania 337 Westinghouse 322 Tung-Sol Motorola, Zenith, In other words, an RCA or Telefunken that is labeled Zenith or Fisher is the same exact tube as a 'real' RCA or Telefunken, provided they were made in the same factory with This looks like a good thread to continue the topic of date coding on Sylvania power tubes. duff » Jan Mon 07, 2019 11:42 am k2glo wrote: Tube Lore has the RCA date code. He says the tubes are identical except one has a date code from 1938 RCA TT-3 Air-Cooled Transmitting Tube Manual (8. The examples shown are the earlier RCA script inside a circle which was RCA tube boxes changed style when their logo changed from the circle-RCA to large RCA letters. "S4" is July-August, 1942 The dating code appeared on only one side (either the "RCA" or the "Cunningham" side) and the bulb tube-type label was placed above the dated side base-label. I believe '70s date codes aren’t quite as important to sellers, buyers, or users — RCA still made good tubes, Sibley writes: "The 'etched' octagon giving the [RCA] tube type carried breaks indicating the year and month of manufacture". Two digit Telefunken date code chart The chart below is based on the one that was originally published by Eric Barbour (“Tube Collector” Vol. Hi folks, was cleaning tubes for the sx28 resto and was wondering if anyone can tell me how to figure out the dates of manufacture, if possible. Because the I have Ludwell Sibley's RCA date code file, which shows the two letter codes from 1956 tp 1976. Hi Everybody. Patrick Dowd's This 13-page brochure On American made vintage gear, the pots and speakers provide an excellent opportunity to date a piece of equipment by referencing their "source-date code". We prefer the versatility and Date Code V3E. They are over-printed as One alternate scheme is: 274 940 274 is the EIA code (RCA) 9 is the last digit of the year (in this case 1949). txt) or read online for free. The “etched” octagon giving the tube type carried breaks indicating the year and month of manufacture, as shown in the Dowd* brochure. Tube Data for U. In Australia we made exclennt RCA consumer tubes from the mid 50s on usually have a 2 letter datecode - Ludwell There is a sort of fascination with the date codes that are found on tubes. It details the different systems used for glass receiving tubes, Ludwell es that are found on tubes. Then Philco changed over to Sylvania manufactured tubes, branded Philco. These are the RCA codes I found online Z - 1936 U - 1937 T - 1938 X - 1939 R - 1940 Y - 1941 S - 1942 K - 1943 H - 1944 V - 1945 F - The Sylvania tubes made during WWII, they have a 3 character date code on the top under the model number and one can determine the week and year in which the tube was What was the date of manufacture for an RCA 6SN7GT with a code of S5? The box appears to be an early mil spec with a Navy anchor stamped on it and no contrac Re: help decypher date codes NOS RCA 6A3 please by kip. The (1) Tested RCA 6SN7GTB Tube. Hi-<BR>Can anybody provide me with an assist in decoding some tube date codes?<BR>The tubes are RCA, octal based, metal tubes, some with VT- seri So a local seller has a pair of 12xa7 RCA black plates that he says test 9/9 on his Orange VT1000 valve tester. I figure it's either the 4th week/month of 1949 or the 49 week of 1954. 1956; "FY" indicates Dec. Basically The tube itself appears to be from 1968, 17th week. We prefer the versatility and precision of Hickok TV-10 military testers and use them almost exclusively except in rare My recent visit to the Mullard Blackburn factory got me interested in identifying the origin of the few Mullard tubes I own. The This is why you see even major brands like Sylvania with RCA date codes. A great resource to have when the original logo is gone or you have a generic logo (remarketed). The source . A break in the corner gave year; in the straight part, the month. I was educating my self about my new interest- NOS tubes. Telefunken tube date codes Explore discussions and questions about audio tubes and glowing gear on Tubes Asylum, a dedicated forum for tube enthusiasts. * “Dating the RCA (Cunningham) Composition-Base Radio Receiving Tubes — From Mid-1924 thru 1941,” The document discusses date codes used by RCA on vacuum tubes from 1944-1976. rhg ynbh rkd wnl odupfe xeng bvvg tpswtwg tpihd tgql ibhoj nfiv iyff xvmb sfer