ONKYO Integra P-306R Preamplifier

This listing has been changed to a preamplifier unit only. The power amplifier is not included, but a custom-made Super Servo Code will be provided.
This is the Integra P-306R stereo preamplifier, released by ONKYO around 1981 with an original price of ¥100,000.
Electrolytic capacitors, which are prone to degradation, have been replaced with audio-grade electrolytic capacitors. The mode selector switch is a generic replacement, not the original. There is no crackling in the volume or other controls, and the PHONE equalizer amplifier is functioning correctly. This unit features the Super Servo Integral system. A Super Servo Code was originally included to prevent degradation caused by the connection cord between the preamplifier and power amplifier, but I have recreated this code based on the circuit diagram. I have confirmed that the servo circuit activates when connected to the power amplifier's ground line, and the Connection lamp indicating operation lights up. Please refer to the photos for connection instructions.
I have tested it by connecting it to a power amplifier and playing CDs and records, and it is currently operating normally.
The item will be carefully packaged with bubble wrap and shipped.
A copy of the P-306R instruction manual will also be included as a reference for connection methods.
As this is an old used item, please consider purchasing it with the understanding that it is sold as-is, with no claims or returns.