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The valves that perform the function of POWER FINALS , in an amplifier device, work in current and have the task of amplifying a signal entered at its input (generally from a first stage called preamplifier) to a level such that they can drive some loads, in audio, generally loudspeakers. The most famous and still used today are the Triode, the Tetrode and the Pentode.
RES664d TELEFUNKEN TP4100 L491D E443N FINAL PENTODE VALVE AUDIO RADIO MILITARY STANDARD...
Excellent and RARE RES664d (or E443N) TELEFUNKEN PENTODO Power Amplifier for Radio, HAM Radio, AUDIO amplification DIY project. HIGH quality and performance!