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ICON AUDIO STEREO 300 MKII
Powerful and affordable tube amplifier, based on the Stereo 40.
Pure Class A
2 x 30W in ultralinear mode
4 x EL34 perfectly matched
Solen condensers
Warm and powerful sound, easy maintenance and multi-valve compatible
Superior headphone output and hand-wired premium construction
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Icon Audio Stereo 300 MkII: The Power and Elegance of the 300B
Some innovations are difficult to surpass, and this is particularly true for the legendary 300B vacuum tube, designed in the 1930s. Widely regarded as the pinnacle of directly heated triode audio, Icon Audio has perfected its implementation to deliver an amplifier that extracts the very best from this iconic tube.
The Stereo 300 MkII is a warm, transparent, and musically satisfying integrated amplifier, capable of delivering 30W per channel with a 20Hz to 20kHz frequency response, ensuring exceptional performance for the most discerning audiophiles.
The 300B: A Legend in High-Fidelity Audio
Originally designed by Western Electric to provide the highest sound quality for cinema, the 300B has remained one of the most respected and cherished audio tubes. Though its design may seem primitive by today's standards, its extreme linearity and low distortion make it an ideal choice for high-end amplifiers.
To fully harness its potential, a high-quality driver circuit is essential. In the Stereo 300 MkII, this is achieved through the renowned 6SN7 (CV181) tube in a cascode configuration, providing detailed and musical response that perfectly complements the warmth of the 300B.
The 6SN7 is a larger, more stable tube with superior thermal performance, delivering a relaxed and highly musical presentation compared to smaller tubes. Icon Audio recommends experimenting with David Shaw, TJ / Full Music, SG Treasure, Psvane, and vintage USA/Russian models to fine-tune the sonic signature.
Intelligent Design for Maximum Compatibility
The Stereo 300 MkII incorporates a passive preamp, ensuring excellent compatibility with virtually any audio source.
To optimize the 300B’s performance, the amplifier features an Easy Bias meter, allowing users to monitor tube status and output power in real-time. This ensures the ideal amplifier setup and prevents tubes from being pushed beyond their safe limits.
Additionally, the input sensitivity is adjustable through the feedback control, enabling operation with zero feedback or different levels, depending on whether the amplifier is used with an external preamplifier or as a standalone unit.
Compatibility and Configuration Options
Since 300B amplifiers are known for their transparency and ability to reveal intricate details, choosing high-quality speakers and audio sources is crucial to achieving optimal performance.
For those looking to maximize 300B tube lifespan, Icon Audio offers an HT-reduced configuration, limiting output to 21W per channel. This significantly extends the life of premium 300B tubes, such as the Western Electric 300B.
Technical Specifications
Design & Build
Hand-wired, point-to-point construction
Heavy-duty chassis, optimized for acoustic isolation
Motorized ALPS HQ volume potentiometer with remote control
Tube Configuration
4 x 300B (output tubes, AC-heated)
4 x 6SN7 (CV181) (pure Class A driver stage)
Output Power
30W per channel @ 8Ω (option to reduce to 23W)
HT-reduced configuration: Maximum output of 21W per channel
Power Supply
Large choke-regulated power supply
Tertiary-wound output transformers
Capacitor Options
Standard SCR capacitors
Upgrade option: Mundorf Silver/Gold in Oil capacitors
Sound Quality & Frequency Response
Signal-to-noise ratio: -85 dB
Frequency Response:
20Hz – 20kHz (-0.2 to -0.5 dB @ 8W, 6.25 dB FB)
Total Harmonic Distortion (THD):
< 0.05% at 1 kHz (1W)
< 0.2% at 1 kHz (8W)
Feedback & Input Sensitivity Options
Adjustable Feedback:
0 dB (no feedback)
6.25 dB
15.2 dB
Switchable Gain Control:
140mV
300mV
790mV
Connectivity
Speaker terminals for 4Ω and 8Ω
Gold-plated input and output terminals
Power & Energy Consumption
Operating Voltage: 117V / 235V
Power Consumption: 150W – 235W
Dimensions & Weight
Width: 380 mm
Depth: 330 mm
Height: 230 mm
Weight: 26 kg (unpacked)
Certifications
CE, ROHS, RAEE, and FCC compliant
Customization & Upgrade Options
For audiophiles seeking the ultimate experience, the Stereo 300 MkII supports multiple customization options, including:
Premium 300B tubes, such as Western Electric 300B
Mundorf Silver/Gold in Oil capacitors, for enhanced detail and resolution
HT-reduced configuration, to extend the lifespan of premium 300B tubes
For more information on custom upgrades and configurations, please contact us.
A True 300B Reference Amplifier
The Icon Audio Stereo 300 MkII is the ultimate choice for those seeking the warmth, transparency, and fidelity of a true 300B amplifier.
Its all-tube design, handcrafted construction, and customization options make it a benchmark in directly heated triode amplifiers.
If you’re looking for a rich, immersive, and sonically faithful experience, the Stereo 300 MkII is an exceptional choice that will satisfy even the most demanding audiophiles.
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