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Concept Amplifiers has been  designed and produced ( in few units)  with the precise porpouse to be the best no-compromise solutions  each one in his cathegory of audio electronics,  without thinking to marketing and production costs. Atlough some of they had some replicas, they are not commercial products

The main  reason of developing so much expensive electronics ( in terms of research,works  time  and production  costs ), is the need to experiment on field new solutions, with complete open mind, not thinking to market, not thinking to fashion of the moment or to audiophile gurus religions and without any predjudgement on components used and circuitry adopted. To make this kind of instruments need  a great effort but it's  also a great fun for designers who love challenges. But the most important fact is that these designs and their production have a great beneficial fall-out on entire our production. Experimentation help us to step up  to new and higher quality levels and adopt new technolocical solutions..  Some solution used on RP1000 has benn applied on latest RP010-B MKII, as well as some solutions used on the Coriolan has been adopted by the Egmont Signature EV08, Fidelio share some concept with RP7-B and RR88.

• Although the Coriolan looks like a classic tube amplifier, it hides a few hi-tech solutions under the hood, that in addition to the use of a traditional tube topology makes it the perfect suitable solution for the mature experienced audiophile, who loves, and is eager to get the highest natural and transparent reproduction, refusing all special effects and colorations (present in many of the other tube designs you can find in the market nowadays)

• The use of vacuum tubes is the more logical solution (from the technical point of view) when a high voltage swing is needed, and on the other hand, the use of triode topologies assure the right, coherent, and natural harmonic distortion pattern, that assisted by some solid state components (in order to control some auxiliary functions) give the amplifier high solidity and long time reliability that an amplifier of this category needs. The amp uses basically EL34 (x4) as power drivers and 12AX7 (x2) as signal amplifiers.

• The separate and sophisticated power supply is an hybrid design that basically blends the use of vacuum tubes rectifiers for more transparency, in this case the legendary 5U4 (x2) and solid state capacitance multipliers, for higher filtering. The use of multiple high value capacitors assures the current reserve for the transients and more dynamics.

• The three position rotary power switch offers a pre-heating standby position, in order to eliminate the unsafe, power, and components life consuming "always on" practice. The Coriolan can be safely left in pre-heating stand-by position, and it is immediately ready for listening while switching it to "on".

• Voltmeters and milli-amperemeter gauges placed on top of the PSU let the user check the basic driver functions.

• Full balanced topology for the best noise rejection and higher dynamics.

• The Coriolan was  totally handmade, with a widely use of non-magnetic metals all around, and silver wiring. Front panel in aluminum covered by polished vinyl give a refined and classic look.

• Quad Mono topology: Four mono Class-A single ended amplifiers, two on each channel working in opposed phase to get a full balanced output, or bridged for the single ended output in unbalanced operation

• Dual Case: Power supply was cased as separate unit, and it works with RC and active capacitance multipliers, for an insane whole 2 Farads of filtering capacity !!! (2,000,000 uF
  Highest Quality Components: Such as the exclusive Alps RK50 potentiometers, Elna- LPO capacitors, metal non inductive resistors 0.5% precision, silver connections, Cryogenically treated selected vacuum tubes, etc.

• Intelligent Tube Biasing: a kind of integrated digital tube tester (one for each channel) make a lot easier to check the tube efficiency, the tube biasing, and tube matching. A must for tube-rolling operations.

• Intelligent Constant Current Generator: The constant current generator was cased in a separate internal ventilated box, this way is possible to reach the optimal temperature in a minute, and hold it constant along the time. So the amplifier will reach in 60-90 seconds the right temperature for an optimal performance

• Pre-heating system: An stand-by system that leaves the power supply capacitor charged and the tubes filament "on", to have the amp always ready for listening.
  Sound footprint pre-configuration: Through some jumpers on the motherboard is possible to configure the harmonic pattern configuration (from totally neutral to an accentuation on the even harmonics) to perfectly match the source used, headphones, and owner preferences
   

• Fidelio has been designed in one of the most classic way:  all vacuum tubes, input,output and interstage transformers.

• The special output transfromers make possible to perfectly match high and low impedance headphome, from 16 to 1000 ohm and the output power is more then  enough to drive special headphones like K100o as well as boxes,

• The power on 8 Ohm is motre then 5W RMS  so it is possible to drive high efficency speakers, in our lab it is used connected to a pair of Klipsh Heresy delivering a very pleasant vintage worm sound.

• One of the peculiarity of this design is the use of 6SN7 as power  output triodes, to make possible this non common solution we have designed special output transformers

Probably the first vacuum tube amplifier designed for the iPod, it has been on the market from summer 2005 to  2006, it has been showed at many exibit dedicated to the iPod and Apple world.

Designed expressly to match the Ultrasone Proline 2500 it was offered on US market  during 2007 by Ultrasone of America and Amazon. A real best seller!

This was not a portable unit but an high-end compact and easy to transport amplifier. It adopeted both RCA analog and USB input  with integrated DAC and was supplied by high capacity battery cells capable to deliver power for more then 100 hrs ( on laters models )An intelligent battery charger with multiple AC sockect was supplied in order to make it usable everywhere in the world. A must vor very demanding audiophile/travellers. It was discontinued due the the high production costs.