The Gryphon – Antileon Signature Stereo


More than five years in the making, the Gryphon Antileon Signature dual mono power amplifier breaks new ground in audio performance, exploring new technologies in components, materials and circuit topology to create a direct music conduit with consummate sonic neutrality, textural purity and dynamic ease.

With an ultra-wide frequency bandwidth (0.5 – 350,000 Hz, (+0 dB, -3 dB) and conservatively rated at 150 W Class A (8 Ohms), Gryphon Antileon Signature doubles power output to 300 W into 4 Ohms, doubling again to 600 W into 2 Ohms, delivering an amazing 1,100 W into a 1 Ohm load for guaranteed stability with any loudspeaker.

The fully balanced differential dual mono design (with separate power cord connections for each channel) employs custom-built twin 1,500 W toroidal transformers mounted in a metal shield encased in epoxy for effective damping. The output stage and driver stage employ separate supplies to isolate the output stage from the input stage. A separate transformer for control and display circuitry isolates them from the signal path.

Twin-tier banks of 80 ultra-fast capacitors deliver 400,000 F to the output stages and 40,000 F to the driver stages. Closely matched input transistors, special ultra high-frequency driver transistors and 40 bipolar output transistors specially selected for high frequency and high current provide speed to delineate the subtlest details and power to recreate massive crescendos.

Unique zero-inductance resistors with exceptional audio characteristics have been specially designed for the Antileon Signature with a flat ceramic plate etched with a thick film/metal film conductive layer which is laser-trimmed for precise impedance.

Defined as much by what is left out as by what is put in, Antileon Signature employs no contacts, no sockets, no current limiting, no global feedback, no output relays and no protection circuitry in the signal path. The only internal wiring is a short length of Gryphon Guideline Reference gold-embedded silver interconnect from the balanced XLR inputs to the printed circuit board. All internal signal transfer is via solid copper busses or 105 m PCB copper traces.

Control functions include Mute, AC Phase check to ensure that the AC power connections for the two channels are in phase, On/Standby for immediate optimum performance without warm-up and Low/High bias options in addition to Green Bias for automatic bias control via a Gryphon preamplifier.

An intelligent, non-invasive protection system with no circuit breakers in the signal path monitors operational status 10 times every second for DC, HF, overheating, short circuit and low AC. An 18-second Soft Start turn-on prevents sudden current draw which could otherwise trigger fuses in the home electrical system.

An integrated service log is automatically updated for a full recorded history of the unit. This information and possible future microprocessor upgrades can be transferred via a special keyfob interface.

The strikingly styled Gryphon Antileon Signature makes head Gryphon Flemming E. Rasmussen proud to have his autograph engraved on the front of every unit. For the serious music lover with an audio system capable of matching its stellar resolution, Antileon Signature simply brings home more of the music.

Product features:

  • Fully balanced circuit
  • 2 x 150 Watts Class A
  • 40 High current bipolar output transistors
  • 440,000 µF power capacitor bank
  • Flat frequency response to beyond 350kHz
  • Gryphon Guideline Reference gold-embedded silver internal wiring
  • Zero global feedback
  • Custom-built separate toroidal transformers
  • Custom-built power capacitors
  • Shielded, epoxy-damped transformer casings
  • Separate power supply for display and control circuits
  • DC servo coupling
  • No output relays
  • Frequency-independent damping factor
  • Custom-built binding posts
  • Automatic Green Class A bias setting or manual Low/High bias
  • AC power status display
  • AC polarity indicator
  • Rigid mechanical structure
  • Microprocessor-controlled non-invasive “smart” protection system
  • Double sealed, mil spec PCB with 105 µm copper traces
  • Upgradeable microprocessor software with integrated service log
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