【Overview】 ・This item is a repaired and restored piece of junk from over 45 years ago. Although all functions have been repeatedly confirmed to operate normally, it is an old device, so it is being sold as a junk item. Due to the recent increase in return scams, we are very reluctantly unable to accept returns as a general rule. No claims and no returns are accepted. As an exception, we will provide free repair service for six months only if you cover the round-trip shipping costs. 【Product Details】 Product: Stereo Cassette Deck Manufacturer: Sony Model Number: TC-K50 Release Date: Around 1978 Original Price: 67,800 yen 【Appearance】 ・Both the front panel and the body are clean, with no significant scratches, dents, or rust, and I believe it is in very good condition considering its age. 【Repaired and Adjusted Points】 ・Complete disassembly and cleaning of the front and rear of the drive unit, application of lubricant ・Cleaning of the recording/playback volume, record/playback switch with ethanol ultrasonic cleaner ・Servo motor circuit offset voltage adjustment ・Replacement of capstan, fast forward, rewind, and counter belts ・Full auto shut-off mechanism repair ・AMS (Automatic Music Sensor) mechanism repair ・Electronic control servo motor speed adjustment ・Record/playback head azimuth adjustment, demagnetization, and cleaning ・Cleaning of pinch roller and capstan ・Playback and recording sensitivity, VU meter sensitivity adjustment 【Operation Check】 ・All functions, including recording, playback, pause, fast forward, rewind, memory function, and AMS, have been confirmed to work. 【Sound Quality Check】 ・Wow and flutter is an excellent 0.06%, which is top class. ・As far as listening to commercially available music tapes, I believe it produces sound that is sufficient for enjoying music as a cassette deck that is over 45 years old. (Recording and playback may be poor depending on the condition of the tape) 【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. ・Playback speed (pitch) can be finely adjusted with the semi-fixed resistor in the capstan motor control circuit, although it requires opening the chassis.