Maintained in 2020. It is a cassette deck that inherits the model number of the famous open reel deck TC-777 released by Sony in 1961, and it is a masterpiece that claims Sony's glorious number 777 for the first time in a long time. Good recording and playback in normal, chrome, and metal, stable with almost no waffles (Tetsuji Oikawa)
Maintenance information: Maintained on 2020.4.26 (head base mechanism cleaning, capstan shaft lubrication, belt inspection and cleaning. The reel stand was repaired due to damage to the left reel tension mechanism. Reel drive transistor and fuse replacement. Left and right pinch roller shaft cleaning and right pinch roller shaft spacer adjustment installation. Left pinch roller replacement and E-ring addition, pinch roller height adjustment and tape pass inspection. Head azimuth adjustment and adjustment of playback level, recording bias and recording level. Level meter indicator value adjustment. Recording calibration level adjustment. Capstan Motor Quartz PLL lock timing adjustment. Sound recording and playback tests and sensory tests using music program sources are excellent. Reference value: REC&PLAY; W&F (WTD): 0.055% but depends on the tape used)
Main specifications: 3 head closed loop dual capstan system quartz lock D.D. BSL green motor frequency characteristics 20 to 20,000 Hz (METAL) SNR 60 dB (Dolby OFF, peak level, METALLIC cassette) wow flutter 0.025% (WRMS) W430 x H105 x D390 mm weight 10.0 kg