Arcam’s A39 integrated amplifier represents the pinnacle of Arcam’s audio engineering. We set out to incorporate everything we have learnt in almost 40 years to deliver an amplifier that will set new standards and provide class-leading sound quality for the best possible reproduction of your music.
With a class G amplifier, toroidal based power supply, acoustically damped chassis, paralleled transistor output stages and exceptionally low levels of distortion and noise the A39 is capable of reproducing music with all its original authority and detail. Rest assured you will hear the music just as the artist intended.
The A39 has been designed with a massive 120 watts per channel into 8 ohms and 240 into 4 ohms. It delivers 20 watts in pure class A mode while allowing for huge extra power reserves from our latest generation Class G topology that is both smart and efficient. During normal operation, distortion is measured in less than one part per million so that this massive power is delivered with total control and finesse.
Class G operation is a way around the traditional problem of switching distortion. In a normal push-pull Class AB amplifier circuit, a transistor only conducts half (180°) of the signal waveform, leaving the paired transistor to cover the other half. The point where the two switch between one another is plagued by non-linearites, causing distortion intrusive to the human ear. That’s why many high-end amplifiers run in Class A, keeping the output transistors constantly powered up – it gives lower distortion, but produces heat.
Arcam turns off the non-conducting transistor more slowly than in normal designs, using a mix of positive and negative feedback in the output stage. The output stage’s supply rail voltages are varied according to the signal level; it uses multiple power supplies rather than just a single one, gradually bringing in the secondary supply as the dynamic load demands it. This means it operates in near Class A mode at low levels, but goes much louder in Class B when needed. This offers a cool-running amp that sounds similar to a Class A design at real-world volumes.
There have been great strides made in improving audio sources and loudspeakers in recent years and the time is right to match them in the field of amplifier design. This groundbreaking amplifier is a must audition amplifiers for music lovers who understand that power is nothing without control.
Continuous power output (20Hz—20kHz at 0.5% THD), per channel
- Both channels, 8Ω, 20Hz—20kHz: 120W
- Single channel, 4Ω, at 1kHz: 240W
- Harmonic distortion, 80% power, 8Ω at 1kHz: 0.001%
Phono (MM) cartridge:
- Input sensitivity at 1kHz: 5mV
- Input impedance: 47kΩ + 270pF
- Frequency response (ref. RIAA curve): 20Hz—20kHz ± 1dB
- Signal/Noise ratio (Awtd) 50W, ref. 5mV input: 80dB
- Overload margin, ref. 5mV at 1kHz: 20dB
- Nominal output level: 900mV
- Output impedance: 240Ω
- Nominal sensitivity: 1V
- Input impedance: 10kΩ
- Maximum input: 4.6V
- Frequency response: 20Hz—20kHz ± 0.2dB
- Signal/noise ratio (Awtd) 50W, ref. 1V input: 105dB
- Maximum output level into 600Ω: 4V
- Output impedance: 1Ω
- Load range: 16Ω—2kΩ
Accessory power output
- 2.1mm DC connector: 6V, 1A
- Mains voltage: 110–120V~ or 220–240V~
- Power consumption (maximum): 1kW
- Dimensions W x D x H (including feet): 433 x 425 x 100mm
- Weight (net): 11.5kg
- Weight (packed): 13.2kg
- Mains lead
- CR902 remote control
- 2 x AAA batteries
- Accessory power cable