The output transformer for this amplifier has been specifically design & wound to withstand +1,000 Volts while capable of response from 10Hz to 70,000Hz at -3.0dB at full power level. The two most important aspects in our output transformer design are to reduce insertion loss and distortion factor. Insertion loss can be viewed as the power loss in output transformer (normally in heat and vibration form) whereas it could have been transfered to drive loudspeaker. We understand the utmost important to improve our output transformer design and aware that every 0.1dB of insertion loss reduction, we can hear more not only dynamic, but also details. Distortion factor in output transformer is the topic that most specification sheets do not refer to. It is one of the major causes that make each output transformer sound different. Ideal output transformer should only transfer signal and should not add any impurity to the signal. Real world output transformer is far from ideal. The lower distortion factor in output transformer, the better the output transformer, thus the purer sound. Low distortion factor output transformer will not make tube circuit sound like solid state; however, low distortion factor output transformer will make you hear more tube sound. We believe that real tube sound is not neccessory mean higher harmonic distortion than solid state counterpart, rather it is more about life, feel and esthetic.