KVA-20 is a stereo tube amplifier with output stage wired in triode running in class A. Output tubes are two 6CA7 per channel. Input tube are ECC81 and ECC82. KVA-20 is internally wired with VdH cables has all gold plated teflon connectors and Mundorf polypropilene signal caps and has double C core output transformers with ultra fast recovery diodes in the PS. Small but beautiful!