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Revox A77 service manual.

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  View and Download Revox A77 operating instructions manual online. A77 tape deck pdf manual download. Download REVOX A77 service manual & repair info for electronics experts.    

 

User Manual - Revox A77 equipped with DOLBY B System - Tape recorder



   

Read or download the pdf for free. If you want to contribute, please mail your pdfs to info audioservicemanuals. The following instructions are with reference to theadditional operations required when utilizing the DOLBY noise reduction system:.

All other index numbers make reference to the operating instructions for the standard version except for the following changes:. It is important that the following conditions are being met in order to obtain the full benefit of the DOLBY B noise reduction process. The DOLBY system reduces only those noise components which originate between the record and playback process; in other words, it affects tape hiss only.

Noise which is already present at the input to the recorder cannot be eliminated. It is therefore, necessary that the original sound event provides an exceptionally wide dynamic range signal to noise ratio of at least 65 to 70 dB. The DOLBY noise reduction system operates with a dynamic filter whose charac- teristics are determined by the constantly varying sound levels. To ensure a play- back performance which is an exact mirror image of the record process, it is absolutely essential that the record and playback levels are equal.

This is achieved by a special gain calibrating circuit record calibration which enables the operator to compensate for differences in sensitivity between different tape oxides or even between batch differences of the same oxide. Record Calibration prior to recording The following calibration procedure is to be performed prior to each recording. Close record level controls 15 and 17 by turning them fully anticlockwise.

The VU meters 33 and 34 will deflect to an undefined reading. With the calibration procedure completed, turn monitor selector 14 to position TAPE off tape monitoring. Previous Next. Download PDF. Signal to Noise Ratio of the Sound Source The DOLBY system reduces only those noise components which originate between the record and playback process; in other words, it affects tape hiss only. Equal Level Requirement for Record and Playback The DOLBY noise reduction system operates with a dynamic filter whose charac- teristics are determined by the constantly varying sound levels.

Switch the recorder on by selecting tape speed and reel size. Load recorder with tape. Turn monitor selector 14 to position CAL. Start machine in the record mode. Nam-BOON ll.



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