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The following section provides a brief explanation of the most salient technical features of the AM-77.
Circuit ‘X’® is AMR’s unique circuit: with NOS thermionic electron valves for voltage gain with a patent-
pending error-cancellation circuit for the Class A matched bipolar output power devices.
OptiGain® inherently outperforms all conventional types of volume controls. At low as well at high volumes,
the dynamic range is virtually unhindered to preserve every bit of minuscule information in the signal.
OptiOperation® modes offer unrivalled functionality and flexibility: one or more AM-77s can be synchronised
to deliver the optimum level of quality and can be seamlessly integrated into home theatre setups.
OptiPower® supply circuit is completely free of regulators. This is an essential pre-cursor for subsequent
thermionic electron valve circuits operating with no negative feedback.
OptiMains® is truly one of a kind as it will detect, monitor and adjust if necessary, the incoming voltage to
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 outclass traditional
EI and toroidal transformers.
OptiSeal® is the galvanic sealing of functional sections in the transformer and includes the use of separate
transformer windings to ensure that noise from one section does not contaminate adjacent sections in a full dual-
mono audio circuit design.
For a more detailed explanation of these and other features, please go to: www.amr-audio.co.uk
Section 6 - Technical Features