An FM/AM tuner developed and equipped with Onkyo's unique dynamic FM feedback technology. FM feedback is a technology that introduces NFB, an amplifier distortion reduction technique, to the tuner's IF circuit and detector. Furthermore, the IF spectrum signal is significantly compressed, achieving a widening effect of the IF circuit's bandwidth. This allows the IF signal to pass only through the part of the circuit with the best phase characteristics, enabling linear amplification and transmission of wide IF signals during stereo reception and dynamic live broadcasts. As a result, in combination with the NFB effect, low distortion and high separation are achieved. In addition, a linear phase filter is installed in the IF, and a wideband linear detector is installed in the detector, resulting in excellent characteristics with a flat detection output from 20Hz to 53kHz. The front-end section has a two-stage switching system for the RF stage: Boost-OFF/ON. The OFF position is for strong electric field areas and short-distance reception, with excellent interference rejection characteristics. After the input triple chain, it goes directly to the mixer without passing through the RF booster. The local oscillator is composed of a parallel-use low-noise twin varicap and a MOS FET buffer to drive the mixer. The ON position is for weak electric field areas and long-distance reception. It includes an RF booster using a MOS FET in the triple tune, resulting in input single tuning. The IF section allows for two-stage switching of the bandwidth: Wide = FM feedback and Narrow, depending on the reception conditions. By combining this two-stage IF bandwidth switching with the two-stage sensitivity switching of the front end, you can obtain the quality that matches the reception area and radio wave conditions. The MPX section employs a PLL IC and is equipped with a 19kHz/38kHz pilot canceller. It is equipped with a random preset memory for 12 FM/AM stations. In particular, stations 1 to 5 are timer-compatible, and they are received sequentially from 1 to 5 stations in conjunction with the timer. A super turbo system is adopted to prevent the effects of modulation noise generated from the power supply and external noise entering from the AC power supply from affecting the signal system. The AM section is equipped with an AM-dedicated IC completely independent of the FM section. It is equipped with automatic noise reduction and an auto-tuning system. 〇 One of the feet on the back of the device is missing.