Интегральные усилители — Aries Cerat Ianus Aperio

The Ianus Aperio belongs to the Ianus series of Aries Cerat. This single-ended integrated uses the TriodeFet output device developed by the company and is priced at GBP 39,950 in the UK. It uses a single amplifying stage without separate input or driver stages, a transformer volume control and a power supply in its own chassis, and it runs in Class A.

Key specs that matter

Aries Cerat rates the output at 35 W into 8 ohms. Gain is 21 dB, depending on the tubes used. Volume is adjusted in 26 steps through a multitap input transformer, which works as a transformer volume control. Inputs are four RCA, one XLR and one Direct input using Aries Cerat's AC link. The main unit measures 420 x 310 x 420 mm and weighs 80 kg, while the external supply measures 420 x 310 x 140 mm and adds 35 kg.

Engineering and use context

In a single-stage design, the output device amplifies the input signal directly, without a preceding voltage gain or driver stage, so the signal passes through only one active stage between input and loudspeaker. Aries Cerat developed the TriodeFet device itself and uses it across the Ianus range. Its integrated amplifiers also include the 845-based Genus and the smaller Protos. A transformer volume control varies the level by selecting different taps on a transformer winding rather than by passing the signal through a resistive attenuator, so volume reduction does not add resistance in series with the signal. The level is therefore set in fixed steps. Housing the supply in its own enclosure keeps its transformers and rectifiers away from the amplifying circuits in the main unit. Single-ended Class A operation means the output device conducts through the whole signal cycle. The Direct input connects Aries Cerat components through the company's AC link format.

Pairing

With its power reserve, the Aperio suits efficient loudspeakers and larger speakers with moderate sensitivity in rooms of about 20 m2 or more. Its XLR input accepts balanced sources, and Aries Cerat's DACs, such as the Kassandra or Ithaka, connect through the RCA, XLR or AC link inputs. The two heavy chassis need a solid support and space for ventilation.

Alternatives

A smaller TriodeFet integrated from the same maker, the Aries Cerat Ianus Protos, offers 20 W into 8 ohms, a 61-step relay volume control and a 60 kg main unit.