【Overview】 ・This item is a repair and restoration of a junk item from approximately 50 years ago. Although the normal operation of all functions has been repeatedly confirmed, it is being sold as a junk item due to its age. Due to the recent increase in return scams, we are reluctantly unable to accept returns. Except for complete non-functionality, please understand that this item is sold as-is, with no claims or returns. As an exception, we will provide free repair if you cover the round-trip shipping costs. 【Product Description】 Product: Stereo Cassette Deck Manufacturer: Sony Model Number: TC-K4 Release Date: 1976 Price: 59,800 yen 【Appearance】 ・The front panel is almost free of scratches and is clean, but there is a very slight rust-like appearance on the chassis. However, considering its age, it is in good condition. 【Repairs and Adjustments】 ・Complete disassembly and cleaning of the front and rear of the drive unit, and grease application ・Complete disassembly and cleaning of the head block, and repair ・Recording and playback volume, ethanol ultrasonic cleaning ・Record/playback switch, complete disassembly and ethanol ultrasonic cleaning ・Capstan, auto shut-off, counter belt replacement ・Auto shut-off, cassette loading mechanism repair ・Electronic control motor speed adjustment ・Playback, recording, VU meter sensitivity, head azimuth adjustment ・Cleaning of the record/playback head, pinch roller, and capstan 【Operational Check】 ・All functions have been confirmed to work, including recording, playback, pause, fast forward, rewind, and timer standby functions. 【Sound Quality Check】 ・As far as listening to commercially available music tapes, I believe it produces sound (wow and flutter 0.18%) that is sufficient for enjoying music as a cassette deck that is approximately 50 years old (recording and playback may be poor depending on the condition of the tape). 【Accessories】 ・1 test tape used for recording, playback operation check, and adjustment 【Important Notes】 ・Please use it for about 1-2 hours a day, as the resin parts have deteriorated over time and may cause malfunctions. ・The playback speed (pitch) can be finely adjusted with a semi-fixed resistor in the servo motor circuit, although it requires opening the chassis.