Abbingdon Music Research CD-77 owner manual Technical Features

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Section 4 - Technical Features

The following section provides a brief explanation of the most salient technical features of the CD-77.

The original Philips TDA1541A digital-to-analogue converter in AMR’s testing and auditioning remains to-date, the most musically satisfying chipset for digital-to-analogue conversion.

OptiSignal® conditioning circuit has optimised every single operating parameter of the Philips TDA1541A including off as well as onboard circuits.

OptiSample® digital engine is AMR’s incorporation of the most advanced digital filter yet: the Digital Signal Processing (DSP) engine from Texas Instruments.

OptiClockLock® system ensures all the clocks in the CD-77 are purposely synchronised to one temperature- compensated, low-jitter master clock module with its dedicated power supply.

OptiDrive® transport mechanism ensures reading of the compact disk is virtually without errors or jitter.

OptiReg® digital power supply is the employment of 14 different, but specifically designed regulators that combine to virtually eliminate digital noise.

OptiValve® analogue output stage uses NOS valves in dedicated circuits for the amplification, rectification and output stages.

OptiMains® will ensure the correct voltage is always supplied to the relevant internal sub-sections.

OptiTrans® power supply transformers are advanced double C-Core types which sonically, are superior to R- Core and comprehensively outclass traditional EI and toroidal transformers.

For a more detailed explanation of these and other features, please go to: www.amr-audio.co.uk

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Contents CD-77 Reference Class Compact Disk Processor Page FCC Warning Laser Safety Page Page Precautions On power sourcesOn placement Touch-Sensitive Buttons Running-InStand-By Contents Technical Features Appendix Troubleshooting & Maintanence Front Panel of the CD-77 1a. Unpacking System connec- tion using XLR connectors Transporting/Moving the CD-77 CD-77 Front Fascia CD-77 Rear Panel RC-77 Remote Control RC-77 battery installationPage Power On/Off Optimising Supply VoltageWarming Up 45 s Standby StandbyLoading Autoplay Play/Pause DisplayFWD/Next StopREV/Reverse Numeric Pad RC-77 onlyRepeat One Repeat RC-77 onlyRepeat All B RC-77 onlyDAC Input RC-77 only Repeat A-BBrightness RC-77 only OptiSample RC-77 onlyElapsed Track Time Track Remaining Total Remaining Time RC-77 onlyScan RC-77 only Intro Scan 10sIntro Scan 30s Program RC-77 onlyProgram No Shuffle RC-77 only 3a. OptiSample Page 3c. Infra-Red Link L t a g e T s i d e E r a t i n g N g e 3e. OptiMains Protection for Excessive Under/Over-VoltagesTechnical Features Figure A.1 Troubleshooting Guide Ii. Factors that affect Playability About the Optical PickupIv. Handling Compact Disks Iii. CD-R & CD-RW Audio DiscsFigure S.1 Specifications Table
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