ProLogue Seven   Description   The ProLogue Seven shares much of its basic circuitry with the ProLogue Five stereo power amp. The novel phase-splitter and driver stage implementation have been adapted for monaural functionality in linearity, distortion, and power delivery. We accomplish this by using an industry-unique dual-feedback topology: Cross-coupled current feedback for superior impulse behaviour and gain stability at any level. We use very small amounts of negative feedback for a more precise gain setting, lower distortion, and lower output impedance. This feedback technology effectively cancels the byproducts of negative feedback, thus creating an amplifier circuit that gives you all the benefits of properly implemented feedback, but without the drawbacks. Newly designed PrimaLuna wide-band low-loss output transformers designed to handle more difficult speaker loads. A 2 Ohm tap is included in addition to the 4 Ohm & 8 Ohm taps. As with all PrimaLuna amplifiers, the ProLogue Seven comes standard with Adaptive AutoBias, fuse protection, and soft-start circuitry for extended tube life. As with the ProLogue Five, the ProLogue Seven also includes upgraded Solen capacitors, and fast-recovery diodes in the power supply for the ultimate in detail and dynamics. 70W mono power amplifier Tubes: 2 x 12AX7, 2 x 12AU7 and 4 x KT-88 Input: RCA single-ended Outputs: 2, 4 and 8 Ohm   Specifications     Specifications Power: 70 Watts per channel Frequency-response: 20Hz – 85kHz +/- 1dB at rated power; 11Hz – 120kHz –3dB @ 1W THD: <0,1% at 1W - 1,5% at rated power into resistive load S/N ratio: 101dB (unweighted) ref full power Input Impedance: 100 kOhm Input sensivity: 911mV rms input for rated output power Power consumption: 125W @ idle; 225W @ rated max. power Net Weight (each): 37.5 lbs / 17 kg Shipping Weight (each): 41.9 lbs / 19 kg Dimensions: (inches): 15.5” x 11” x 7.5” (mm): 395 x 280 x 190 (L x W x H)                             site credits