====TELEFUNKEN AUDIO TUBES==== 1938 to 1980
LS/GU/FU50
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Left to right, original 1938 Telefunken Berlin LS50, 1944 Telefunken Erfurt made L50, 1944 Telefunken Milano made 12P50, 1961 Telefunken Ulm FL152, 1963 Telefunken EL152, 1964 Svetlana GU50, 1967 Ulyanovsk GU50, 1978 Ulyanovsk GU50, 1985 WF LS50, 1995 Chinese FU50.

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copyright 2007 to 2011