Telefunken date codes. Setting-up the original information in straight "decode" format, we get the table below. And all of that OBJECTIVE data would SEEM to indicate the smooth plate came first. The code is sometimes preceded by the first letter of the factory (“B” for Berlin or “U” for Ulm) and followed by a two digit internal number. Simply enter the code (like 052124 or 13156) into the input below and click the button to see the converted date. 00: out of stock: EL34/6CA7 used tested good Mullard nickel base, early production 1950s date code. No etch codes in the glass on a Tele, so the Diamond was always the only way to tell genuine from "fake". ) Need help with more Telefunken remote codes or setting up your remote with your Telefunken These have the Telefunken "2-digit" date code on the back branded by Telefunken. I'm hoping you can help me identify these, and in general help me figure out: Feb 16, 2017 · Good Morning Everyone, I'm trying to figure out what the date codes and manufacture site are on my Telefunken tubes. Priced per single tube, double the price for a matched pair. Dec 2, 2010 · The date code on mine is 391016 and they were bought new in 1970 and have serial #4133 and #4144. Limited stock on hand. About 100 other folks that know a great deal more than I seem to agree (based ONLY on what I have read). It supports numerous formats mentioned in our How to Read Expiration Dates article and their variations. 1 – Turn on TV. From 1930 to 1968, Telefunken used a 2-letter code to identify the date of production. Indeed, some GE 12AX7 and 7025 tubes from the 1970s were also Mullard made, so they must have made some 6681s for GE as well. (If not repeat with a different code. Jul 16, 2011 · I've read the charts that give the codes on Telefunken tubes for dating, but have a couple questions for the experts out there. The date codes “B fl 01” Telefunken ECC83 12AX7 Date and Factory codes A bit about codes. Mar 10, 2021 · I've started going through them and one of the first things I've come across are some Telefunken tubes that could be ECC81/ECC82/ECC83 tubes, but have all the writing rubbed off. Unsure about how to interpret various expiration date codes? Our date code converter is here to help. It had originally come from a tube enthusiast in Europe; the German- titled chart had been retitled in English. Counterfeit tubes will have them Laser scribed into the surface and can show micro cracks on the edges of the logo. $225. There is also a "4" stamped inside the glass on the bottom of the tube (where the diamond would be if it was a Telefunken), and the inner shield is grey, not shiny. A great but very hard to find tube. Looking on Ebay, you can find Telefunken 12AX7 tubes with the diamond, made in Germany, 2 letter date code for $30-50 and then what appears to be same tubes for close to $200 or more. Both tubes tests as new with low noise. Tube has a halo getter. I've read where they didn't use the letter "J" but have found several used ECC83/12AX7's with codes of "JO" and "JQ". I've also have a Tele 12AT7 I pulled from a oscilloscope with the same "JO" code. This chart had originally come from a tube enthusiast in Europe; the German- titled chart had been retitled in English. Britain" marking that indicates English Mullard manufacture. This list shows date codes covering Telefunken tube production between 1930 and 1968. Feb 27, 2014 · Date codes are usually done with acid, so they are burned into glass. Anyone have Telefunken date codes? By DoctorD in forum Apr 27, 2009 · This date code appears stamped on a metal plate, inside the tube, attached to the getter frame. Common USA EIA Codes Dec 5, 2006 · Other significant features: when seen, date codes are vertically arranged (from top to bottom) ‘YWW’ with Y underlined. If the diamond mark is missing, the tube was likely made by Siemens or another of Mar 29, 2008 · Date Codes On Telefunken 12AX7/ECC83. This article includes a corrected version of the date code chart originally published by Eric Barbour. The black print on the glass has the Sovtek logo and says "Made in Russia" with late 1998-2001 date codes. A note on Sylvania Chrome Domes: The “Chrome Dome” moniker was first applied to particular early 1950s vintage Sylvania 6SN7GTs by tube enthusiasts. Aug 4, 2024 · Telefunken date codes Sweet tube, Lovin my Telefunken smooth plate 12AX7 and 12AU7's. The real determinants for a tube are construction, when and where it was made, and etched codes. Buck Dec 7, 2020 · Greetings everyone, please point me to previous threads if this has already been covered. 3 Digit 280 Code = Raytheon, Made in USA 3 Digit 188 Code = GE, Made in USA. Tests very good, 1956 date code. They were made FOR Telefunken BEFORE Telefunken got into the 6922 market! Telefunken tubes have a diamond shape molded into the glass on the bottom center of the tube. Genuine Telefunken Germany (Berlin and Ulm) made Valves have a diamond mark moulded into the glass between the pins. In other words, an RCA or Telefunken that is labeled Zenith or Fisher is the same exact tube as a 'real' RCA or The Sovtek 6922 / E88CC tubes in this precisely matched pair have dish getters with two support posts. reb, Oct 1, 2013 #29. 2 – Press and hold the TV key and enter the codes for your brand. Edit: Inspect the Diamond logo very closely, It's molded during the manufacturing of the base and protrudes out from the surface. Setting-up the original information in straight This list shows date codes covering Telefunken production between 1930 and 1968. Telefunken Tube Date Codes; Source Material from Eric Barbour Originally presented in "Tube Collector" Vol. USA codes will always be in the form of 3 or 4 numerical digits. Since they are so scarce, it is advisable to treat any "Bugle Boy" 6922 or 7308 tube as a fake, unless you can clearly see the Holland date codes on the glass. This listing is for an almost perfectly matched and balanced quad of 1975 Ei Yugoslavia ECC83's with matched date codes, the long Telefunken smooth plates and halo gettersThey have Made in India printed on it, why they lied about tube origins so often I don't knowBut the 2A1 ⩀5B code tells Sep 14, 2019 · On certain songs the Mullard and Telefunken tubes really shined but it seemed like the Telefunken tubes were a little dry sometimes and The Mullard Blackburn were just a little bit dirty. These are made by Siemens Halske Munich and do not have the diamond because they are not made by Telefunken. Determining if they are real by the date code and other construction factors requires some skill. why it is important to understand tube construction, tube codes, and tube history, or at least purchase your tubes from someone who does. Telefunken tube date codes If you are fortunate enough to have some Telefunken tubes with labels that are intact, here is an explanation of how to determine when they were made. Amperex and Mullard tubes have a pair of alpha-numeric date codes printed in dark grey near the bottom of the tube. 2 No. There are so many pages and articles about Telefunken date codes, but with all those facts, it still cannot be determined for sure in which period which type was produced and in which factory – Berlin or Ulm. Y = last digit of year, WW = week number of year. Just a single tube. 4: This list shows date codes covering Telefunken tube production between 1930 and 1968. Level 4; Posts: 4540; Tube Tone; Telefunken Date Code's Brand new old stock NOS genuine 1962 Telefunken ECC83 12AX7 Pair, matching codes, came from a brand new in box 1962 amplifier kit that was never built, so they are as new as the day they were made 50+ years ago and test perfect, even the logo paint is perfect as new. . Racfan9 Oct 17, 2007 · UPDATE: One astute customer has informed me that GE offered 6681 tubes with the typical top seams, date codes, and "Gt. Here above is an example of fake Amperex Bugleboy 6922 tubes. TELEFUNKEN DATE CODES Source Material from Eric Barbour Eric sent in a source chart for date codes covering Telefunken production between 1930 and 1968. Some tubes, like Telefunken, don’t have acid date code, it’s usually printed on the glass as part of the silkscreen and very easily removed. Here are some examples and a list of common USA EIA codes. Mar 10, 2021 · Telefunken Tube Date Codes I've seen valves with Telefunken printing, diamond bottoms and gold flashed pins that were fakes, and performed very poorly. If your tube has these codes on it, you can get they’re USA tubes. Jun 25, 2016 · Telefunken multi-brand remote codes for TV’s. I don't know the source, but the valves they started with weren't Chinese. 1950s production in the old style Telefunken boxes, tested and matched. Mar 29, 2008 · Only date codes and actual samples and Telefunken's production records can do this. 3 – If your TV turned off then you entered the right code and setup is complete. The most desirable of the Telefunken ECC83 tubes is the “smooth-plate” or “flat-plate” versions. Author Topic: Telefunken Date Code's (Read 2492 times) 0 Members and 1 Guest are viewing this topic. The Ei tubes were not bad at all but we're kinda inbetween the Telefunken East Germany and Mullard Blackburn UK tubes. plexi50.