"The Aiwa AD-3800U is a three-head, dual-capstan deck that incorporates both Dolby-B and Dolby-C noise-reduction systems. Through the use of a microprocessor chip it is also able to make automatic adjustments of record bias, equalization, and sensitivity, thus minimizing performance differences between tape brands. Separate record and playback heads, using laminated sendust and hard permalloy construction, are enclosed in a single housing. The recording head has a 4-micrometer gap to provide full magnetic penetration of the tape, while a 1-micrometer gap is used for the playback section to increase high-frequency resolution. A d.c. servomotor drives the capstans, and a second d.c. motor is used for the cassette hubs. The transport of the AD-3800U is solenoid operated. Cassettes are inserted, tape openings downward, into slides on the rear of the cassette-well door. A tinted window on the door provides label visibility, rear illumination allows the user to see how much tape is left on a side, and the heads are accessible for routine cleaning when the door is open. Head demagnetization is accomplished by an automatic circuit that operates when the deck is turned on or when the adms button is pressed. The process takes less than 2 seconds, and a LED signals its operation. Record levels are set with a pair of long-throw horizontal slider controls, and a similar (though smaller) slider is used to determine output level. The level indicators are three-color, sixteen-segment peak-reading displays calibrated from —30 to +10 dB. The electronic four-digit counter can be switched to read out minutes and seconds when recording or playing back, but not during fast-winding operations. Pressing the data system button initiates the tape-optimization procedure, during which bias, cal, and eq indicators flash. On completion, after about 16 seconds, a ready indicator comes on and the tape is automatically rewound to its starting point. Pushbuttons with LED indicators are provided for Dolby-B or Dolby-C noise-reduction systems and for tape-type selection. Additional buttons and switches permit muting the recording during commercials, activation by an external timer, and memory rewind and/or play. The rear panel of the AD-3800U contains the usual input/output jacks, a DIN-type connector for a remote-control accessory, and the microphone-input phone jacks."