【Introduction】 Sony's radio cassette recorder, the CF-1990. It has been maintained, repaired, cleaned, and tested for operation. This is Sony's highest-end mono model, adding high output to the high-performance lineage of the CF-1980. Equipped with a 20cm woofer and a 5cm tweeter, it has Sony's unique high-frequency extension, but with a high output of 5.5W, the bass is also reproduced firmly, and the sound quality is extremely excellent. While it has sound pressure, you don't feel "loudness," and its reproduction is different from the 1980 series. In addition to auto-stop, it also features mechanical auto-reverse and auto-rewind functions, making it the highest-end in various aspects for mono, but due to the high output, voice coil breaks and transistor failures are common, so maintenance care is necessary. The main maintenance aspects include replacing all capacitors, replacing deteriorated transistors, replacing pinch rollers and drive rubbers, disassembling and maintaining switches, and replacing deteriorated IFTs and diodes (if original stock is unavailable, appropriate compatible parts are used). ※Some parts are summarized from photo 16. Also, to prevent rust and deterioration of the exterior, the front metal net has been repainted and coated. Although it requires a lot of work and the price is high, I think you will be able to use it for a long time. 【Included】 ○ Main unit and power cord ○ Two manuals on how to use the radio cassette recorder ○ One manual describing daily maintenance methods ○ Two types of maintenance-specific solvents, 10ml each ○ 8 cotton swabs ※Instructions are explained in the manual 【Function Test / Condition】 Playback / Recording ○ Fast forward / Rewind / Stop ○ Auto-stop / Auto-repeat / Auto-rewind ○ Pause ○ Playback speed is appropriate ○ Tape counter ○ Volume adjustment, sound quality adjustment ○ Various mixing ○ Level meter ○ AFC switch ○ Tape select ○ Loudness ○ Tuning light on ○ Headphones ○ (Mono, so only the left ear) External input ○ (Playback from smartphone) Microphone input untested Battery operation ○ Radio FM AM SW ○ ※SW changes with time and distance. Antenna ○ 【Maintenance】 Basic maintenance such as disassembly, various inspections, and replacement of deteriorated parts has been performed. Details in the comments. 【Request】 Final maintenance will be performed before shipping, but no warranty is provided. We will respond if you contact us with any subsequent problems. It is an expensive item, so please purchase with your understanding. #MaintainedItem