【Overview】 ・This item is a repaired and restored junk item from over 45 years ago. Although all functions have been repeatedly confirmed to operate normally, it is being sold as a junk item due to its age. Due to the recent increase in return scams, we are unfortunately unable to accept returns. Please understand that this item is sold as-is, with no claims or returns. 【Product Details】 Product: Stereo Cassette Deck Manufacturer: Sony Model No.: TC-K50 Release Date: Around 1978 Original Price: 67,800 yen 【Appearance】 ・The front panel is clean, but there are small, faint scratches on the top of the chassis. Overall, there is no rust, and I believe it is in generally good condition for its age. 【Repairs and Adjustments】 ・Complete disassembly, cleaning, and lubrication of the drive unit (front and rear) ・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, peak meter sensitivity adjustment 【Operational Check】 ・All functions, including recording, playback, pause, fast forward, rewind, memory function, and AMS, have been confirmed to be working. 【Sound Quality Check】 ・Wow and flutter is an excellent 0.11%. As far as listening to commercially available music tapes is concerned, 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, and adjustment. 【Important Notes】 ・Please use the unit for approximately 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 of the BSL green motor control circuit, but it requires opening the chassis. 【Reference】 ・https://audio-heritage.jp/SONY-ESPRIT/player/tc-k50.html