The Aksa 100 is a solid state, push-pull power amplifier module delivering 109 watts RMS into an 8ohm load and 218 watts into a 4R load, depending somewhat on the regulation of the power transformers. Input sensitivity for 100W output into 8R is 740mV rms into a Zin of 47K.
The bigger brother to the AKSA 55, the AKSA 100 employs the same philosophy and design principles to create a power amplifier with almost the same sonic attributes, but at considerably higher power. The AKSA 100 offers power with glory, and provides a sensible option for people with low efficiency speakers, or a larger listening room.
The AKSA circuit board is extremely compact, and two large heatsinks
with 0.37C/watt thermal rating are supplied with the kit. Each pre-drilled
heatsink accommodates its own amp module, ensuring that in even the hottest
climate this amplifier will always keep its cool. Even the drivers have
their own unique, pure copper heatsinks, which also carry the high current
supply to both the drivers and the inner pair of output devices.
The AKSA family of audio amplifiers was developed to overcome most of
the sonic problems of SS push pull technology, and incorporate some highly
innovative thinking, not just dictated by the engineering (which is crucial)
but heavily influenced by the subjective issues of listening to music.
Mindful of the engineering issues, the design cycle has also been focused
on the audiophile listening experience, and the inspired desire to transfer
human emotion via the artform of music. The justification for this
is simple; people listen to music to be moved, not to marvel at
the elegance of the amplifier design or the paper specification. While
the latter aspects are important, they are a means to an end, and not
the end in itself.
The AKSA amplifiers create a presentation comparable to a quality tube amplifier, whilst delivering stunning resolution and a pure, sweet, musical sound. This has been achieved at low cost in an attempt to balance the pricing policies of high end audio against the principles of DIY audio. Like many tube amplifiers, the AKSA 100W amplifier shines with just about any loudspeaker system, including ribbons and horns, regardless of efficiency.
Key features of both AKSA amplifiers are the utter absence of intermodulation,
extraordinary low frequency grip, profound emotional communication, startling
transients, crystalline clarity, and palpable depth of image.
This last feature is unusual for solid-state amplifiers.
The 100W AKSA is powered from a 49V volt positive and negative supply
which is built in dual mono configuration. The best toroids to use for
the power supply (they are NOT supplied in the kit) are 33-0-33Vac 300VA
types, with 7% regulation or better. These are supplied under part number
077019201 by Plitron, based in Canada.
The transformers have little sonic impact, so no specific brand is recommended;
most of the power supply benefits accrue from the filter caps and rectifiers.
All AKSA amplifiers run very efficiently in Class AB with a quiescent
current of 58mA per complementary pair, and deliver imaging, slam and
clarity rivalling the best Class A designs but with none of the troublesome
thermal problems. AKSAs are part of the green revolution - they are VERY
This amplifier has won accolades around the globe for its astonishing
sonics, especially in North America and South East Asia. While the AKSA
uses a time-honored topology tweaked and refined with state of the art
components and painstaking dimensioning, it truly represents the pinnacle
of development of modern day analogue amplification. The elegance and
compactness of this jewel gives it stunning looks as well as performance,
and the low cost guarantees it will be a top seller for decades to come.
Build this amplifier, and join the growing cadre of blissful AKSA owners,
many of whom go on to buy more amplifiers for multi-amp Home Theatre installations.
BUILDING THE AKSA:
The kitset comprises:
A pair of high grade PCBs, specification matched power output devices, all passive and active components, a custom power supply pcb with ultrafast rectifier diodes and the full complement of filter capacitors, a premium quality, pre-drilled and tapped heatsink, extensive and detaied instructions, and full support and backup. Even a self-adhesive AKSA badge is included!
WHAT YOU HAVE TO SUPPLY:
There are a number of essential components that you need to supply. (Mostly
these are the large, heavy components that are impractical to ship around
the world one at a time!)
YOU WILL NEED:
A case to mount the components in, connecters and wire, a mains switch and IEC power entry module, the power supply transformers (two required of 33-0-33Vac secondary voltage and 300VA rating), an indicator LED, rubber feet for the case, and several small fasteners.
Tools and facilities:
Nirvana and Nirvana Plus upgrade kits:
Two upgrades are available. The Nirvana uses very high quality components
selected after exhaustive listening tests. The Nirvana Plus adds even
more components in the audio jewelry category to further enhance performance.
In accordance with our philosophy of affordable, DIY audio, these grades
of components are not included in the regular kit because of their higher
cost and significant sourcing difficulties.
The prices for all our products can be found at: BUYING/PRICELIST