THIS IS WHAT I TESTED, VU METERS LIGHT UP AND WORK, COUNTER WORKS, PLAY, RECORD, FAST FORWARD, REVERSE, STOP, ALL WORK. PAUSE WORKS, AUTOMATIC SHUT OFF WORKS, PITCH, TAPE SPEED AND REEL SIZE ALL WORK. IT HAS A VERY CLEAN GOOD SOUND. THE HEADPHONES ALSO WORK. THIS IS THE EXTENT OF MY TESTING. THE FACEPLATE IS NICE, HOWEVER, HEAD COVER HAS SOME SCRATCHES. THE VENEER CABINET COVER HAS WEAR AND TEAR IN PLACES-CORNERS, EDGES. ALL OF THIS IS VISIBLE IN MY NUMEROUS PHOTOS. IT WILL BE VERY WELL PACKAGED. Track system: 4-track, 4-channel, stereo/multi channel system. Heads: 1 x GX record, 1 x GX playback, 2 x erase. Motor: 2 x reel drive, 1 x capstan. Reel size: up to 10.5 inch reel. Wow and flutter: 0.06%. Frequency response: 30Hz to 21kHz. Signal to Noise Ratio: 54dB. Total harmonic distortion: 0.5%. Input: 70mV (line), 0.25mV (mic). Output: 0.775V (line). Semiconductors: 65 x transistors, 63 x diodes, 4 x IC. Dimensions: 440 x 527 x 240mm.