The EL34 is a thermionic valve or vacuum tube of the power pentode type. It has an international octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits and was designed to be suitable as a series regulator by virtue of its high permissible voltage between heater and cathode and other parameters.
Power pentode tube designed to be used in audio amplifiers. Made in Great Britain Manufactured by Mullard, branded RCA New old stock * No longer available for export. SKU: EL34-RCA