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Mono plate triode, made by Telefunken-Germany in the 1930's. Called the "Queen of  the European Triodes", the AD1 seems to be a sort of 4-volt version of the 2A3. We have 1 piece only in NOS and pristine condition. For such an archaic tube tested very strong on the tester Taylor 45C where the GM 5.00mA/v = 100%.

Price : US$ 990,00 

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