The Allnic Audio A-5000 DHT is a flagship monoblock power amplifier built upon an uncompromising "pure DHT" (Directly Heated Triode) circuit design. Unlike most high-power amplifiers that utilize beam tetrodes or pentodes (such as the KT120, KT150, or KT170), the A-5000 DHT employs exclusively directly heated triodes throughout the entire signal path, from input to output.