Mono plate triode, made by Tungsram-Hungary in the 1940's. Called the "Queen of the European Triodes", the AD1 seems to be a sort of 4-volt version of the 2A3. We have 4 pcs in NOS and pristine condition with original boxes. All tested excellent on the tester Taylor 45C where the GM 5.00mA/v = 100%.
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