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ICON AUDIO STEREO 845 PP
Integrated amplifier.
4 compatible valves 6L6 KT66
4x 6SN7/CV181 first stage valve and phase splitter
2x 30w continuous ultralinear output
Optional remote control board
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Icon Audio Stereo 845 PP: The Ultimate Expression of Tube Amplification
The Stereo 845 PP represents Icon Audio’s flagship in integrated amplifiers. Designed to extract the maximum potential from the legendary 845 vacuum tube, this amplifier is the perfect choice for those seeking a warm, rich, and immersive sound.
The development of the ST845 took over twelve years, applying our expertise to create a no-compromise amplifier where every component has been meticulously selected to allow the 845 tube to shine to its full potential.
With 40W per channel, this amplifier effortlessly delivers high volume levels, maintaining a fluid, detailed, and effortless musical performance in almost any listening environment.
Push-Pull Pure Class A Triode Design
While many Single-Ended (SE) designs have been criticized for distortion and low power output, the ST845 proves that it is possible to achieve powerful and well-defined bass with minimal distortion.
The Push-Pull Pure Class A configuration of the ST845 is a groundbreaking approach in tube amplification, offering:
Greater dynamics without losing warmth
A three-dimensional soundstage with precise imaging
Lifelike texture and realism in every instrument
The ST845 has been tested with a wide variety of speakers and delivers a neutral and natural musical presentation, capturing the essence of every recording with the highest fidelity.
Despite reducing the power output from the 100W of the MB845 monoblocks to 40W, the actual difference in sound pressure level is only 3.9 dB, making the ST845 a more compact alternative without sacrificing sonic impact.
Technical Specifications
Design & Construction
Pure Class A throughout the circuit
Push-Pull 845 Pure Triode configuration
Hand-wired, point-to-point construction
Heavy-duty chassis optimized for thermal management
Tube Configuration
4 x 845 (precision-matched output tubes)
2 x 6SL7 (first-stage tubes)
2 x 6SN7 (output driver tubes)
1 x GZ34 (driver stage rectifier)
Output Power
41W @ 8Ω with 1% THD (single channel driven)
38W per channel @ 8Ω with 0.5% THD (both channels driven)
32W @ 4Ω (11.3V max output)
39W @ 16Ω (25V max output)
Sound Quality & Frequency Response
Signal-to-noise ratio: -93 dB
Damping factor: 14
Channel balance: Better than 0.1 dB
Total Harmonic Distortion (THD):
0.3% @ 8W
0.09% @ 1W
Frequency Response:
10 Hz – 20 kHz (-0 dB) @ 8W
20 Hz – 20 kHz (0.25 dB) @ 38W
41 kHz (-0.1 dB) @ 8W
40 kHz (-1 dB) @ 38W
Transformers & Components
Tertiary-wound output transformers for ultra-low distortion
Encapsulated transformers for reduced electromagnetic noise
Solen/SCR Hi-Fi audio capacitors (Jensen copper foil available upon request)
PTFE-insulated pure silver-plated copper audio wiring
Connectivity & Inputs
Compatible with speakers from 4Ω to 16Ω
Gold-plated speaker and input terminals
Four line-level inputs
Tape loop for recording/playback
Controls & User Configuration
ALPS Japan volume potentiometer with remote control
Selectable operation as an integrated amplifier or power amp
Built-in Easy Bias Meter
Input Sensitivity
High Sensitivity Mode: 300mV for full output
Low Sensitivity Mode: 950mV for full output
Power Supply & Energy Consumption
Operating Voltage: 220/240/115V
Power Consumption:
220W under normal use
500W maximum consumption
Dimensions & Weight
Width: 44 cm
Depth: 40 cm
Height:
24 cm (without cover)
28 cm (with cover)
Weight: 35 kg
Included Accessories
Plexiglass tube cover for protection
Comprehensive user manual
Certifications
CE-certified, compliant with international safety standards
A Compact Alternative Without Compromising Quality
For those who seek the sublime sound quality of the 845 tube but do not require the extreme power of the 100W MB845 monoblocks, the ST845 is the perfect solution.
Maintains the same premium sound quality
Consumes less energy
More compact and easier to place in any setup
The real difference in volume between 100W and 40W is just 3.9 dB, meaning that in most environments, the ST845 will deliver virtually the same sonic experience while being smaller and more energy-efficient.
A True Reference in High-End Integrated Amplifiers
The Icon Audio Stereo 845 PP is an exceptional integrated amplifier, engineered to provide the ultimate tube audio experience.
Push-Pull Pure Class A Triode Design
No-compromise handcrafted construction
Premium high-end components
This amplifier sets a new benchmark in its class.
If you’re looking for unparalleled realism, a three-dimensional soundstage, and an unmatched level of musicality, the ST845 is the ultimate choice for the most demanding audiophiles.
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