Интегральные усилители — Aries Cerat Genus

The Genus is an integrated amplifier from Aries Cerat using the 845 directly heated triode in single-ended configuration, priced at GBP 18,950 in the UK. It works in Class A1 without feedback, has a relay volume control with remote, and includes a headphone output, so it covers the functions of a preamplifier and power amplifier in one heavy chassis.

Key specs that matter

One Elrog 845 output tube per channel is driven by a Siemens E280F, and the two gain stages are linked by AC-link coupling. Output is 25 W per channel in Class A1. Bandwidth is 11 Hz to 60 kHz, second harmonic distortion is -64 dB and third harmonic -73 dB at 1 W, and noise is below -100 dB. Sources connect through four RCA inputs or one balanced XLR input. Output taps are selectable from 1 to 16 ohms, with three pairs of speaker terminals, and a 6.2 mm headphone output is fitted. The power supply uses two 400 VA toroidal transformers and four independent supplies, and idle consumption is 400 W. The chassis measures 520 x 530 x 280 mm and weighs 67 kg.

Engineering and use context

The 845 is a large directly heated triode transmitting tube, and in a single-ended circuit one tube per channel amplifies the whole waveform in Class A. Class A1 means the grid is never driven positive, so no grid current flows. Without negative feedback, the amplifier does not compare its output with its input. AC-link coupling is Aries Cerat's term for the coupling between the two gain stages. Bias can be adjusted while the amplifier is running, using a built-in meter, which allows tube wear to be compensated over time. Selectable output taps let the transformer be matched to loudspeakers of different nominal impedance. The relay volume control, operated by remote, also handles input selection and balance. Four separate supplies feed different parts of the circuit.

Pairing

With its modest power, the Genus suits high-sensitivity loudspeakers, such as horn designs or large efficient floorstanders, whose impedance can be matched with the output taps. It needs ventilation because of the heat from the 845 tubes and the high idle draw. The headphone output serves private listening.

Alternatives

The Aries Cerat Ianus Protos is a TriodeFet single-ended integrated amplifier with 20 W into 8 ohms, five RCA inputs and a separate power supply.