Bigman80
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Post by Bigman80 on Sept 5, 2020 7:45:24 GMT
Genuine Telefunken Germany (Berlin and Ulm) made Valves have a diamond mark moulded into the glass between the pins. If the diamond mark is missing, the tube was likely made by Siemens or another of the Dutch Philips companies. The codes printed on the glass may be Telefunken codes, but without the diamond mark in the bottom glass the tube was not actually made by Telefunken. Telefunken was an old German company created back in 1903. By 1906 they were building arc radio transmitters, and by 1907 were demonstrating radio transmission of music, only a year after Fessenden used his microphone to broadcast voice in the USA. By 1935 they were building the first tape recorders, along with AEG in Germany, and by 1936 were transmitting the first television broadcasts of significant power, that being the coverage of the Olympic games in Berlin. Valve codes changed from the late 1960s and beyond until the Berlin and Ulm factories shut down, the codes were as follows: On the side of the valve there is a 7 digit code beginning with a letter B for Berlin or U for Ulm, and might end with a letter. You only need the first letter and the first 5 digits to determine the factory and the manufacture date. For example, U9208811: U= Ulm, West Germany Day=reverse the first and second digit=29. Month=third and fifth digits=08=August Year=fourth digit is the year, 8=1968. Therefore, we have Ulm factory, August 29, 1968. Another example: B2009300 B=Berlin factory. Day=reverse the first and second digit=02 Month=third and fifth digit=03=March Year=fourth digit=9=1969 This code would then be Berlin factory, March 2, 1969. *all information in this post was obtained at www.audiotubes.com/teledate.htm
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Post by karma67 on Sept 5, 2020 8:02:11 GMT
Genuine Telefunken Germany (Berlin and Ulm) made Valves have a diamond mark moulded into the glass between the pins. If the diamond mark is missing, the tube was likely made by Siemens or another of the Dutch Philips companies. The codes printed on the glass may be Telefunken codes, but without the diamond mark in the bottom glass the tube was not actually made by Telefunken. Telefunken was an old German company created back in 1903. By 1906 they were building arc radio transmitters, and by 1907 were demonstrating radio transmission of music, only a year after Fessenden used his microphone to broadcast voice in the USA. By 1935 they were building the first tape recorders, along with AEG in Germany, and by 1936 were transmitting the first television broadcasts of significant power, that being the coverage of the Olympic games in Berlin. Valve codes changed from the late 1960s and beyond until the Berlin and Ulm factories shut down, the codes were as follows: On the side of the valve there is a 7 digit code beginning with a letter B for Berlin or U for Ulm, and might end with a letter. You only need the first letter and the first 5 digits to determine the factory and the manufacture date. For example, U9208811: U= Ulm, West Germany Day=reverse the first and second digit=29. Month=third and fifth digits=08=August Year=fourth digit is the year, 8=1968. Therefore, we have Ulm factory, August 29, 1968. Another example: B2009300 B=Berlin factory. Day=reverse the first and second digit=02 Month=third and fifth digit=03=March Year=fourth digit=9=1969 This code would then be Berlin factory, March 2, 1969. *all information in this post was obtained at www.audiotubes.com/teledate.htmjust to add,fake tele's can also have the diamond etched these days.
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Bigman80
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Post by Bigman80 on Sept 5, 2020 8:04:43 GMT
Genuine Telefunken Germany (Berlin and Ulm) made Valves have a diamond mark moulded into the glass between the pins. If the diamond mark is missing, the tube was likely made by Siemens or another of the Dutch Philips companies. The codes printed on the glass may be Telefunken codes, but without the diamond mark in the bottom glass the tube was not actually made by Telefunken. Telefunken was an old German company created back in 1903. By 1906 they were building arc radio transmitters, and by 1907 were demonstrating radio transmission of music, only a year after Fessenden used his microphone to broadcast voice in the USA. By 1935 they were building the first tape recorders, along with AEG in Germany, and by 1936 were transmitting the first television broadcasts of significant power, that being the coverage of the Olympic games in Berlin. Valve codes changed from the late 1960s and beyond until the Berlin and Ulm factories shut down, the codes were as follows: On the side of the valve there is a 7 digit code beginning with a letter B for Berlin or U for Ulm, and might end with a letter. You only need the first letter and the first 5 digits to determine the factory and the manufacture date. For example, U9208811: U= Ulm, West Germany Day=reverse the first and second digit=29. Month=third and fifth digits=08=August Year=fourth digit is the year, 8=1968. Therefore, we have Ulm factory, August 29, 1968. Another example: B2009300 B=Berlin factory. Day=reverse the first and second digit=02 Month=third and fifth digit=03=March Year=fourth digit=9=1969 This code would then be Berlin factory, March 2, 1969. *all information in this post was obtained at www.audiotubes.com/teledate.htmjust to add,fake tele's can also have the diamond etched these days. Yes, that is true! Good shout. It is etched rather than moulded usually, so look at the pics very carefully before you pull the trigger
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Post by da2222 on Oct 27, 2020 20:04:53 GMT
Genuine Telefunken Germany (Berlin and Ulm) made Valves have a diamond mark moulded into the glass between the pins. If the diamond mark is missing, the tube was likely made by Siemens or another of the Dutch Philips companies. The codes printed on the glass may be Telefunken codes, but without the diamond mark in the bottom glass the tube was not actually made by Telefunken. More commonly they were made in the 1970s in East Germany by RFT who acquired plate stampers and Telefunken machines. RFT made tubes for the East German military and other Iron Curtain countries for military purposes. Unfortunately the quality was never as high as the West German TFKs...
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Bigman80
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Post by Bigman80 on Oct 28, 2020 8:18:59 GMT
Genuine Telefunken Germany (Berlin and Ulm) made Valves have a diamond mark moulded into the glass between the pins. If the diamond mark is missing, the tube was likely made by Siemens or another of the Dutch Philips companies. The codes printed on the glass may be Telefunken codes, but without the diamond mark in the bottom glass the tube was not actually made by Telefunken. More commonly they were made in the 1970s in East Germany by RFT who acquired plate stampers and Telefunken machines. RFT made tubes for the East German military and other Iron Curtain countries for military purposes. Unfortunately the quality was never as high as the West German TFKs... A shame isn't it. TFK valves are fine forever. If only they knew then how big the market for them is lol
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Post by Deleted on Apr 2, 2022 13:03:27 GMT
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Take it and don’t come back
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Post by alit on Apr 2, 2022 18:06:34 GMT
More commonly they were made in the 1970s in East Germany by RFT who acquired plate stampers and Telefunken machines. RFT made tubes for the East German military and other Iron Curtain countries for military purposes. Unfortunately the quality was never as high as the West German TFKs... A shame isn't it. TFK valves are fine forever. If only they knew then how big the market for them is lol Wish we'd have known when you could buy them for buttons!
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Bigman80
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Post by Bigman80 on Apr 2, 2022 18:08:09 GMT
A shame isn't it. TFK valves are fine forever. If only they knew then how big the market for them is lol Wish we'd have known when you could buy them for buttons! I had loads at one point, but sold them all togo towards buying something......think it was the first Soekris. They went cheap in comparison to now. A real shame.
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