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Icon Audio Stereo 40 MkIII 6AS7 Integrated Valve Amplifier
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Icon Audio Stereo 40 MkIII 6AS7 Integrated Valve Amplifier

£1,249.96 Exc. VAT |  






Icon Audio Stereo 40 MkIII 6AS7 Integrated Valve Amplifier

Please Note Various upgrades are available for Icon Audio Valve Products. Please call for details and Prices

It is ten years since Icon Audio made their first amplifier the “Stereo 40”. Since then they have made many other designs exploring the wonderful world of valves. In this time Icon Audio has gained an enviable reputation for quality, innovation and value. To celebrate this they decided to embody these qualities in an amplifier that is of very high quality, a little bit different and at a very affordable price.  A triode amplifier is the obvious choice, but the high cost of the vintage type triodes would make the amplifier expensive, so Icon Audio cast their net a little bit wider and found a more modern “military” valve that has often been overlooked….

The 6AS7 started life as a triode power regulator in the early 1950’s, but it has such excellent audio qualities that it quickly became a “hi fi” valve. Its low voltage and high current means that Icon Audio can make excellent output transformers, it also is “indirectly heated” giving lower noise and its low price means that re-valving will not be painful to your pocket.  Its heater current is a little high but causes no problem. If Icon Audio were going to design a modern triode, we would be looking for exactly these qualities.

Giving 33+33 Watts Push-pull it makes an amplifier that will drive almost any sensitivity of speaker. Its biggest drawback is its low gain, but again this is no problem using Icon Audio's expertise gained in designing the MB845/805 and 2A3 amplifiers. They used their favourite driver valves the 6SN7 and 6SL7 which are of a similar vintage so are sonically well suited and provide an excellent voltage drive. The existing Stereo 40 series chassis is ideal, and keeps costs down. Icon Audio designed special transformers for the 6AS7 output and different power requirements. Their LDT Tertiary Output Transformers has an extra (third) winding which put simply, allows the output transformer to compare both the input and output, and ‘nulls’ distortion, thereby dramatically improving the performance, so much so that there is no global feedback (integrated).

The brand new design is finished with a fine metallic paint work that is easy to clean and is wear resistant. A 10 mm solid alloy front panel with polished dark chrome alloy knobs. And Icon Audio's attractive Plexiglas valve cover to create a stunning visual impression. On the scales at 25Kg, most of this weight is the higher than normal grade of iron that we use. And their transformers are wound with pure copper (99.9999% pure). 


Specifications and Features 



•  Comprehensive manual supplied
•  Full instructions for valve change included and bias meter
•  All hand wired point to point
•  No printed circuit or tag board to ‘colour’ sound
•  Blue ALPS volume pot (Japan)
•  Class A, all Triode front end
•  Output circuit all pure Triode
•  4x 6SA7 precisely matched for best performance
•  1x 6SL7 first stage valve, 2x 6SN7 phase inverter
•  274B valve rectifier for smooth sound
•  No global feedback used (integrated operation)
•  Standby switch to save valve life and power
•  35 Watts per channel, 33+33W both channels driven
•  Signal to noise level -95dB
•  Freq response (L) 20Hz – 20kHz +/- 0dB 15W
•  Freq response (H) 20Hz – 20kHz +/- 1dB 15W
•  Min bass frequency for full power 15Hz
•  THD 0.56% (L) 1.3% (H) both @ 15 W
•  Suitable for 3 to 16ohm speakers (8 & 4 Ω taps)
•  Damping Factor 5.00
•  Supplied with attractive safety guard.
•  Audiophile quality metal film resistors (Taiwan)
•  Rubicon/Nichichron power caps.
•  Purple LED mains indicator
•  Choke regulated power supply
•  Audiophile SCR/Solen Polypropylene audio caps.
•  Optional Jensen Copper foil paper in oil upgrade
•  Silver PTFE audio cable
•  99.9999% pure transformer copper
•  High grade long grain transformer iron (Japan)
•  Custom hand wound Tertiary output transformers
•  Ceramic valve holders for minimum noise/leakage
•  Gold plated Input & speaker terminals
•  Four line inputs – CD, Tape, Tuner, Aux
•  Tape monitor circuit with ‘Record Out’
•  280mv input sensitivity (H) Integrated
•  680mv input sensitivity (l) power amplifier
•  230/240volts 180w Min, 250watts max signal.
•  2A AS rear fuse
•  CE, ROHSS and WEEE where applicable.
•  390mmW, 390D, 230H, 20kg (a minimum of 30mm height should be added to allow for ventilation)





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