Description
METAXAS (MAS) IRAKLIS High End Audiophile Stereo Power Amplifier 50 Watts RMS Per Channel Audiophile Power Amplifier Top and bottom plate : stainless steel plate.included original wood(plywood) carrier case.120VAC 60HzS/N No. 0 570Unit net weight : 18Kgs (40LB)Good working condition. * Since this power amplifier does not have a power relay, you must turn off the power and then turn off the preamplifier after some time has passed. THE METAXAS IRAKLIS: Reviewed by Jean Hiraga/Patrick Vercher, LA NOUVELLE REVUE DU SON, France We have already tested in this column one of the best models in the prestigious Metaxas range, the Solitaire amplifier. We have selected this time from the reference such as Marquis, Charisma, Opulence or Soliloquy, the Iraklis Amplifier which powers 2 x 50 W. One finds, on the Iraklis Amplifier - Hercules in Greek, a symbol of strength - a conception of pure audiophile which is always present in each piece of this range of Australian origin. This company, Metaxas Audio Systems (MAS), directed by a man with a grand passion for high end audio, Kostas Metaxas has always fixed as its objective, the conception of amplifiers and preamplifiers responding to the different needs of audiophiles particularly the perfectionists, and to this end the company makes no concessions that could destroy the performances in terms of transparency or dynamics. The Iraklis, of smaller dimensions, renders the same aesthetic as the 2 x 100W Solitaire. It is very different from the classical rack modesl with which we are familiar and has the box form with front face, almost square (22x18.5) anodised black linked to a quite narrow chassis (20.5cm) but quite deep (37cm). The heatsinks of the power suplies are not placed conventionally - usually on the top of the chassis - but they are placed behind of the chassis on lateral sides of it. If this conception was not enhanced by chrome, by an impeccable finish, one could be foregiven for thinking that it was a creation of an amateur audiophile more anxious about problems of thermic dissipation or searching for very short internal links rather than a classical high end piece of equipment. The implementation of the different elements shows that there is no mystery on these points. The linking between each RCA input (gold plated of excellent quality) is reduced to a few millimetres. In output, the speaker terminals are very near the output stage transistors which are Japanese Toshiba complements 2SC 2563/2SA 1093 rated at 80 watts. All the components of the amplification section of each channel, with the exception of the power supply, are on a surface of note more than 8 x 10cm. It is difficult to do better and this philosophy is applied to all of the best pieces like the Charisma preamplifier which has no internal wire link. If the philosophy of the circuit is not really a new one, it uses formulas that have always proved to be amongst the finest of the audio specialists: driver stages working in pure class A, power supplies of huge dimensions with very fast rectifiers in parallel and filter condensers of very high capacity (22,000mF x 4), Darlington type power stage complemented and temperature stabilised, differential and symmetric input circuits, multiple local feedback circuits which allow the application of a total negative feedback which is only 10dB. Bessel type input filtering which eliminates radio frequencies above 500kHz, in the gradual slope this allows the removal of all incidence on the stability or on the phase in the audio band. On each channel the active components are limited to about 15:2 power transistors, 2 driver transistors, (2SC 2275/2SA 985), 1 operational amplifier comparer (LF351, which gives compensation for DC offset) input transistors and pre-drivers of Amercian and European origin. (BC 549, 559, 2N 2205 2219). The components of diverse origins, (Europe, USA, Japan) have each been chosen according to criteria as much technical as it is subjective: WIMA MKS4 polycarbonate condensers, metallic film resistors with a 2% tolerance, polystyrene condensers (for small value). On the power supply side, the transformer under the armour-plated cover is 1000VA (over dimensioned because 300VA would have been more than sufficient) has on the second side, four fuses for protection and another one, general, on the first side. The rectification is not assured by a diode bridge but by some (triplets) of rapid diodes IN4004 shown in parallel (not commutation pics). The configuration being double mono type, the power supply circuits are separated from the transformer which has a single common winding but a double secondary winding. All of the pieces composing the chassis are made starting from non-magnetic metals such as stainless steel, light aluminium alloys. Compared with the Solitaire, the Iraklis offer for the price of a limited power to 2 x 50W, a simple push-pull output stage (the Solitaire is a quadruple push-pull type). The back panel has only the essential: input connectors, H.P. connectors, A.C. connectors. The front panel only has the on/off switch. For the specifications, the manufacturer proclaims a signal to noise ratio of -117dB (with a short circuited input), an input impedence of 130 kOhms, a damping factor of 500 and an average harmonic distortion of 0.25%.
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