Audiophilepure

You have the choice of directly-heated triodes (DHT) or indirectly-heated power tubes (IDH) utilized as triodes. With the DHT tubes, the filament (heater) and the cathode are combined in the tube. These are triode output tubes that audiophiles are most familiar with and include the 2A3, 300B, and 211. An IDH tube has a separate heater and cathode. These include the familiar 6V6, 6L6, EL34, EL84, and KT88. These are all pentodes and tetrodes can be wired to behave as triodes. While SETs are valued by audiophiles, they are expensive, generate quite a bit of heat, and take up a lot of space. The IDH tubes are cheaper, run cooler, and are more compact. Your decision depends on your budget and sound preferences.

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