Friday, July 22, 2016

Ypsilon Aelius II

Only the name remains the same AELIUS II is a push-pull hybrid monoblock power amplifier using only two gain stages with no overall feedback providing power to drive real world speakers with unmatched transparency and musical involvement.

The first gain stage uses a tube in single-ended class A operation, transformer coupled to the output stage. It is unusual practice to implement an inter-stage transformer in a solid state or even hybrid amplifier. With the transformer two tasks are achieved. Perfect phase splitting and low impedance drive. Thus no need to use an additional intermediate amplifying stage, so transparency and purity of the signal is preserved.

We developed under extensive listening tests and measurements a special transformer for this purpose with a very wide bandwidth of 10-75 KHz. The bandwidth of the transformer defines also that of the amplifier.

In AELIUS II a recently developed input transformer is added that extends the purity of the signal path even further. It also gives the opportunity of a balanced input in the amplifier, adding versatility of using longer interconnect cables.

The output stage uses components of the same polarity (N-channel), working in the same topology. The output of the amplifier is symmetrical so both output connectors, plus, minus, carry signal in opposite phase.

Great attention was paid also in the power supply design. It uses high current inductors for smooth and quiet filtering.

The output stage is self-stable, eliminating the need to use servo circuits for adjusting dc offset. Both outputs, plus and minus carry signal in opposite phase.


Output Power before clipping: 220W rms/8 Ohm (first 60W pure class A), 350W rms/4 Ohm
Bandwidth: 11Hz-75Khz / -3db
Output Impedance: 0.25 Ohm
Input Impedance: 47K Ohm
Gain: x30 (29.5db)
Inputs: Unbalanced / Balanced
Input Tube (various): i.e. Siemens C3g
Rectifier Tube (various): i.e. 6CA4 / EZ81
Dimensions: 425x425x230 mm (16.7"x16.7"x9.1") (W x D x H)
Weight: 45 Kgr. (100 lbs.) each, per mono amp
Prices: $ 39,000 (pair) € 27.000 (pair)
A full Silver Edition is also available

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