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The Icon Audio Stereo 40 MKIII is a valve amplifier designed for audiophiles, capable of using EL34/6CA7/KT77/KT66/KT88/6550 valves. It delivers 40 watts RMS per channel in Ultralinear mode and 20 watts RMS per channel in Triode mode, with a signal-to-noise ratio of -90dB and frequency response from 20Hz to 20kHz with minimal deviation. The amplifier features a choke regulated power supply, valve rectifier, and custom hand-wound tertiary output transformers that reduce distortion without global feedback. It is hand wired point-to-point with no printed circuit boards, using audiophile quality metal film resistors, polypropylene audio capacitors, and PTFE silver-plated internal wiring. The volume control is a Japanese ALPS motorized potentiometer, and the unit includes gold-plated input and speaker terminals. Inputs include CD, Tape, Tuner, and Aux, with a tape monitor circuit and record loop. The amplifier supports 4 and 8 ohm output taps and has a standby switch to save valve life and power. It weighs 25 kg and measures 390mm wide, 210mm high, and 410mm deep. The amplifier is supplied with an attractive valve cover and conforms to CE, ROHS, and WEEE standards. It is known for a warm, clean sound with good bass and a well-detailed soundstage, suitable for 4 to 16 ohm loudspeakers. The power consumption ranges from 76W standby to a maximum of 240W. The amplifier includes a bias meter and remote control for convenience. This model is no longer the latest but remains highly regarded for its sound quality and build.
Amplification power output and characteristics
Analog signal output specifications
Input and output connections
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The STP-80's power @ 8ω is 35W against the Stereo 40 MKIII's 40W, its signal-to-noise 95 dB against 90 dB, and its thd 1.000% against 0.150%. Both share output impedance (4Ω).
The ProLogue One's power @ 8ω is 35W against the Stereo 40 MKIII's 40W, its signal-to-noise 89 dB against 90 dB, its thd 0.250% against 0.150%, and its weight 17 kg (37 lbs) against 25 kg (55 lbs).
The R800i's power @ 8ω is 48W against the Stereo 40 MKIII's 40W and its thd 1.000% against 0.150%. Both share signal-to-noise (90 dB) and output impedance (4Ω).
The KAV-300iL's power @ 8ω is 200W against the Stereo 40 MKIII's 40W, its signal-to-noise 99 dB against 90 dB, its thd 0.040% against 0.150%, and its output impedance 47Ω against 4Ω.
JAS Audio Bravo 2.3
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