The Gryphon Mephisto Stereo
- Pure Class A 2 x 175 Watts (8 Ohm), 2 x 350 W (4 Ohm), 2 x 700W (2 Ohm), continuous RMS
- Pure Dual Mono configuration with separate AC power inputs
- Zero global negative feedback
- 40 high current bipolar output transistors
- 500,000 microFarad capacitor bank
- DC servo-coupling
- Gryphon internal wiring
- Output coupled via massive copper bussbars
- No output relays
- Decoupled transformer castings
- Military spec. double-sided printed circuit boards
- Optimal circuit layout for shortest possible signal path
- Two separate Holmgren toroidal transformers with internal magnetic shielding
- Separate power supplies for amp and digital circuits
- Gold-plated Swiss Neutric XLR input sockets
- Gold-plated custom-built Gryphon binding posts
- Backlit, touch-sensitive front panel controls
- 12V remote power trigger for automatic turn-on
- Automatic Green Bias setting or manual Low/Mid/High bias
- Non-invasive protection system
- Power consumption at idle below latest EU requirements
- Designed and built in Denmark
Size (W x H x D) cm 52x34x71
As befits a product of its unique pedigree, the Gryphon Mephisto power amplifier stands in a class all its own when it comes to the crucial area of maintaining dynamic integrity, regardless of load conditions.
Mephisto is built to meet the challenge of the most advanced contemporary loudspeakers which typically present vicious reactive loads while drawing huge amounts of current. The dual mono Mephisto is capable of massive peak current swings and, equally vital, can do so into very low impedances without losing its cool.
Because Mephisto's perfectly linear output impedance preserves the integrity of the audio signal unconditionally, regardless of frequency or signal level, the amplifier's exceptional load tolerance makes it an ideal partner for the very finest loudspeakers.
In keeping with long-standing Gryphon tradition, the quality of sound reproduced by Gryphon Mephisto is completely level-independent. It is a huge amplifier capable of delivering its best at any volume setting, from background levels to full throttle.
To generate and control such pure power, each Mephisto channel is fitted with separate AC power inputs and individual custom designed Holmgren transformers with generous filtering capacity well-suited to the delivery of high pulse current. The fully regulated gain stage power supply ensures long-term reliability and safety.
Pure Power In, Pure Power Out
Since it is the function of a power amplifier to modulate the mains current from the wall socket, the presence of even miniscule amounts of noise in the mains voltage can prevent a system from living up to its ultimate potential.
The carefully regulated and filtered power supply of the Gryphon Mephisto removes harmful high-frequency noise and voltage spikes without compromising current capacity. The complete removal of mains noise enhances focus, immediacy, transient crispness and soundstage depth for a more beguiling and engaging listening experience.
Zero Global Negative Feedback
While negative feedback is a widespread means of suppressing measurable static forms of amplifier distortion, copious amounts of feedback have the unfortunate side effect of introducing an over-damped, sterile sound, because the feedback itself leads to a rise in audible, dynamic distortion.
Gryphon Mephisto is designed with zero global negative feedback in order to meet the dynamic demands of the very best analogue and digital source components. The exceptional bandwidth of the Gryphon Mephisto äóñ beyond 350 MHz - is achieved despite the total elimination of feedback.
Extreme Attention to Detail
Each printed circuit board in the Gryphon Mephisto is designed to facilitate accurate assembly and precision mounting to set a new standard for mechanical and electrical stability.
Ideal constant safe operating conditions for all transistors in all amplifier stages maintain consistent performance, regardless of variations in temperature or signal level.
Only the finest components are employed throughout for optimal electrical and audio characteristics, including Takman resistors from Japan, Class A dual J-FET transistors in the input buffer for speed and clarity, a balanced differential input circuit based on a single carefully selected dual bipolar junction transistor. The voltage amplification stage incorporates high-speed Zetex surface mount transistors with minimal capacitance and high DC current gain (Hfe) and the output stage employs high-speed Toshiba pre-driver transistors.
A fully symmetrical, regulated low noise voltage supply has been used for all voltage amplification sections. Eight 56,000 microFarad capacitors with low ESR (Equivalent Series Resistance) for a total capacity of 448,000 microFarad/100V smoothes the voltage to the output supply.
Static shielding isolates primary and secondary windings in the massive dual Holmgren transformers designed and built especially for the Gryphon Mephisto.
By eliminating output relays, Gryphon Mephisto achieves an extraordinary low output impedance. But most importantly, because output relays that can handle huge constant currents tend to have poor low to moderate signal transfer characteristics, the best relay is quite simply no relay at all.
As always with Gryphon, what is left out is just as critical as what goes in.
Mephisto is equipped with effective protection against overheating, DC input offset, short circuit, RF and incorrect voltage supply. Slow-start turn-on circuitry analyzes and confirms the status of the transformer, bridge rectifier, power supply, reservoir capacitors and amplification circuit prior to full power-up and before accepting any input signal.
Because the advanced Mephisto protection circuitry is kept outside the signal path, full protection is achieved at no sacrifice in sound quality.
The Mephisto binding terminals are custom designed, massive, gold-plated connectors which provide secure power transfer with speaker cables of any diamete
Weighing in at a healthy 108 kg and worthy of its origins as a one-of-a-kind design concept to demonstrate exactly what can be done with no constraints or restrictions of a monetary , practical or technical nature, Gryphon Mephisto offers stunning analytical capabilities that cut straight through to the emotional core of recorded music.
Paired with the equally uncompromising Gryphon Pandora preamplifier and connected with advanced Gryphon interconnects and speaker cable, the Gryphon Mephisto will continue to define the state of the audio art for years to come.