【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 very reluctantly unable to accept returns. We kindly request no claims and no returns. As an exception, we will provide free repair services only 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 in very good condition with no scratches, and there is very slight rust on the chassis. However, there are no dents or scratches, and I believe it is a beautiful item considering its age. 【Repairs and Adjustments】 ・Complete disassembly and cleaning of the front and rear of the drive unit, and application of grease ・Complete disassembly and cleaning of the head block, and repair ・Ultrasonic cleaning of the recording, playback volume, and recording/playback switch with ethanol ・Replacement of capstan, auto shut-off, and counter belts ・Repair of auto shut-off and cassette loading mechanism ・Repair of recording circuit, muting circuit, Dolby circuit, and other circuits ・Adjustment of electronic control motor speed ・Adjustment of playback, recording, VU meter sensitivity, and head azimuth ・Cleaning of recording/playback head, pinch roller, and capstan 【Operation 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 0.16%) 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 tape's storage condition). 【Included Accessories】 ・One 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 the semi-fixed resistor of the servo motor circuit, although it requires opening the chassis.