AMR AM-777 SE

Hybride Integrated Amplifier

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OptiGain®

OptiGain® is AMR’s unique amplification circuitry design: it is the combination of premium thermionic electron valves in the voltage gain stage with a patent-pending “Class X: Jikoda circuit” comprised of matched bipolar output devices.AMR’s “Class X: Jikoda circuit” in real-time, simultaneously detects and cancels unwanted artifacts in the audio signal: none pass to effect the playback of music. The same cannot be said of traditional amplification designs found in mainstream amplifiers (of which the lion’s share employ solid-state amplification) that use designs based upon the feedback circuit which in theory and in practice, is ‘after the event’ as it goes back and adjusts the circuit’s input. AMR through its exhaustive testing and auditioning, found that with generic feedback designs because errors in the audio signal still pass through, it is fundamentally flawed and largely accountable for the undesirable “solid-state signature” leveled at such sources. This is one of the main reasons why many have deemed the use of solid-state devices as an inferior approach to high-quality amplification when compared to the employment of valves. As a result, with the AM-77, the resultant synergy of the OptiGain® circuit is the ability to amplify the delicate audio signal to an exemplary high level: whilst still retaining the sought-after finesse characteristically found only in the highest quality, “no feedback”, single-ended valve amplification designs.

OptiValve®

The analogue section of the AM-777 utilises AMR’s OptiValve® analogue stage with zero negative feedback and the 6H1n-EB valve. This is a premium version for long life with improved mechanical construction. With no operational amplifiers or solid-state devices, this is a major factor behind why the AM-777 sounds so organic and “valve-like” that it can be compared to the finest SET amplifiers.

OptiUSB® Input

AMR’s design team has developed a USB DAC solution and maximised its potential for digital audio playback. The AM-777 with its dedicated USB DAC, is able to receive a USB signal (via a PC/Mac) and its OptiBus® USB digital transfer solution to enable all music content (including WAV, AAC, WMA, MP3 etc.) stored on a PC to be played back directly without a conventional digital source, with signal integrity preserved to the highest level.

OptiLevel®

OptiGain® inherently outperforms all conventional types of volume controls to ensure that at low as well at high volumes, the dynamic range is virtually unhindered while preserving every bit of minuscule information in the signal. Also, incorporated is “Level Offset Matching” where different level input sources can be preset to the same level for the most enjoyable listening conditions.

OptiOperation®

OptiOperation® modes offer unrivalled functionality and flexibility. Whatever the requirements of the system, one or more AM-77s are more than capable of delivering what is needed at the optimum level of quality and can be seamlessly integrated into home theatre setups.

OptiTrans®

OptiTrans®power supply transformers have been designed as advanced double C-Core types to sonically surpass even the impressive R-Core transformers used in many high-end components and comprehensively outclasses traditional EI and to roidal transformers used in many peer group products.

OptiChassis®

OptiChassis® is based upon the “ratio aureum” design principle along with a pure copper inner chassis. The result is an unrivalled low resonance signature, optimised electrical and thermal properties.

OptiCool®

OptiCool® offers exceptional cooling performance without the need for traditional resonant heatsinks which resonate as many tuning forks.

Underpinning the design behind each and every AMR component is the use of premium parts which were chosen after extensive evaluation, lengthy and comprehensive listening tests. These include silver leaf capacitors, Sanyo Oscon capacitors, precision wire wound resistors, 70um gold plated, military-grade printed circuit boards, German-made premium film capacitors, AMR’s own power supply polypropylene film Music Capacitors, and zero-noise Schottky rectifiers. It is worth noting that many amplifiers that cost twice, even three times as much, do not use such dedicated components.

Specifications

- Inputs:4 x RCA, 1 x XLR Bal. shared with 1 RCA, 1 x USB

- Volume Control: -71dB – 0dB in 1dB steps + Mute

- Input Sensitivity (IHF 2.83V Out)/Impedance: < 0.05V / > 20KOhm

- Analogue Outputs: 1 x RCA; 1 x XLR per channel

- Output impedance: 0.33 ohm, 20 - 20,000 Hz

- Frequency Response (-1dB): 10Hz - 30kHz

- Signal-to-noise ratio “A” weighted: >100 dB

- Total Harmonic Dist. + Noise (THD+N): < 0.3%

Power Output IHF Dynamic Power

- 60 watts per channel at 4 or 8 ohm (stereo mode)

- 70 watts per channel at 8 ohm (monoblock mode)

- 120 watts per channel at 2 or 4 ohm (monoblock mode)

FTC

- 60 watts per channel at 4 or 8 ohm (stereo mode)

- 70 watts at 8 ohm (monoblock mode)

- 120 watts per channel at 2 or 4 ohm (monoblock mode)

Operational Modes

- Pre-Main amplifier mode;

- Power amplifier mode

- Monoblock option;

Thermionic Electron Valves amplification stage:

- 6H1n-EV fitted

- ECC88, E88CC, 7308, Cca, 6DJ8, 6922,

- 6H23n-EV optional

Power Transformer

- 380 VA Custom Torroid (Output Stage)

- 32 VA Custom EI Transformer (Valve Stage)

Power consumption

- Standby: <1 W

- Power on: 25 W

- at rated output (4R): 250 W

- Dimensions: 45 cm W by 12 cm H by 37 cm D

- Weight: 14 kg

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AMR AM-777 SE

Hybride Integrated Amplifier