TRIODE VERSUS TETRODE

摘要

Luke Manley, VTL's CEO, explains that the sonic differences between triode and tetrode make each more appropriate for certain types of material. 'Triode mode is less efficient, so the amp will deliver about half its power. Grid capacitance is higher, so high frequency bandwidth is reduced. Triode, therefore, isn't recommended for orchestral material where maximum power and resolution of dense sonic detail are required. 'Triode has less high-order distortion and inherently lower output impedance because the plate resistance is much lower. Since the loop gain is lower, there is less feedback, but in triode less feedback is required for linearity and low output impedance. This creates a more lush, "classic" sound, which many listeners prefer for small ensemble and vocalist presentation.