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EL503 / 8278
The EL503 Tetrode Tube is an excellent power amp for AUDIO amplifiers particularly used in the 60s and 70s. Excellent sub quality of the famous EL34 pentode. Produced by Siemens, RT, BHT, PHILIPS, it has been especially used in PA Amplifiers (Public Address) and musical instrument amplifiers, with extraordinary performance.