Thank you for viewing. The following is the product that has been repaired. It appears to be from 1999. ○ The crackling in each knob was severe, but it has been resolved through maintenance. ○ One knob was missing, so a replacement has been installed. In addition to the repair, the following modifications have been made: The op-amp has been socketed, and the New Japan Radio NJM072D, which won first place in an op-amp comparison video on a certain video site, has been mounted. (You can search for "os-2 op-amp" to find it.) To enjoy the difference in sound, the super-standard New Japan Radio NJM4558DD is also included. Measures have also been taken to prevent oscillation associated with this op-amp replacement. In addition, the clipping section has been changed, using rectifier diodes for overdrive and LEDs for distortion, to make it more amplifier-like. Furthermore, the sound quality of the overdrive side and the bypass sound have been improved. In addition, all electrolytic capacitors have been replaced with new ones, and the power supply section has had its capacity partially increased to improve sound quality. ELNA electrolytic capacitors are used. Also, some parts have been cut to improve the sound thinning during bypass. (Lead wires cut from the parts are used for the connecting wiring.) In addition, the bypass line uses point-to-point wiring, further improving the sound thinning during bypass, in addition to the above. The lead wires of each part are used for this wiring. In addition, bypass capacitors have been added to the power supply and op-amp sections to prevent noise. Also, the screws (thumb screws) have been changed to silver-colored screws, and the check lamp has been changed to a high-intensity green. The pedal guide push rubber has been replaced with a new one. For the solder used in the modifications, Japan Almit KR-19RMA was used for the main power supply section, and KESTER44 was used for the rest. Operation has been confirmed with an adapter and a 9V battery. There is no crackling in the knobs. This is a listing for the main unit only. Thank you.