UNISON RESEARCH UNICO 90

CLASS A INPUT STAGETUBE / SOLID-STATE HYBRID DESIGN Unico 90 is a class AB hybrid integrated amplifier with zero feedback, as the most precious valve amplifiers uses only two stages. The heart of the Unico 90 circuit is found in its hybrid structure. All of the gain, and subsequently the "character" of the amp, is determined by the only tube stage made with ECC83 and ECC 81 in particular multiple-parallel-totem-pole. Output power: 100+100 W  RMS, 8Ω / 160+160 W  RMS, 4Ω Frequency response: -1dB @ 12Hz e 45kHz -3 dB Input impedance: 21Kohm // 300pF Input sensitivity: 860mV RMS Input stage: Pure A class, double triode  totem pole ECC83  and  parallel totem pole ECC81 This single stage due to the particular circuitry is able to amplify the input signal and drive  directly the power stage. Output stage: Class AB thermostable, complementary Hexfet (3 pairs for channel) Number of stage: 2, This amplifier due to the particular circuitry is realized by only two stages: input stage and output