A preamplifier released in 1979 by Denon (currently Denon). Aiming to reproduce analog discs with the highest quality, it was equipped with a newly developed real-time equalizer. It is also known that audio critic Tetsuo Nagaoka used it as a reference machine. - Brand: DENON - Model: PRA-2000 - Function: Stereo Preamplifier - Volume Adjustment: Large volume knob - Input Terminals: AUX, TUNER, PHONO 1, PHONO 2, PHONO 3 - Power Indicator: Power LED indicator ↓ Product Description A control amplifier that challenges the limits of disc playback and is equipped with a real-time equalizer amplifier. The equalizer section employs a non-feedback real-time equalizer amplifier, which is a further development of the CR type. The configuration consists of two stages of a newly developed low-noise FET DC linear amplifier and a CR type equalizing filter between the stages. The FET in the first stage is a parallel differential, and a cascode bootstrap circuit is adopted to significantly improve the S/N while preventing the deterioration of high-frequency characteristics. Furthermore, by removing the input coupling capacitor, not only was the coloration of sound by the capacitor eliminated, but also, combined with the 150V high-voltage power supply operation using high-output, high-speed transistors with Pc800mW and fT120MHz, a high output and wide dynamic range of 47V clipping level is achieved. In addition, high S/N is achieved by lowering the impedance of the CR type equalizing filter. Polypropylene capacitors and ±1% grade metal film deposition resistors are used for the CR elements.