Icon Audio Stereo 40 MkIV EL34 Tube Integrated Amplifier

You can purchase this product in installments with Consel. Click here for more information.


New product

2 008,20 €

This article it's not in stock but can be ordered and it will take a number of days indicated into the Blue tab below, to be shipped to you. Please verify the availability for immediate shipping of other eventual versions of the same product.


Icon Audio Stereo 40 MkIV Integrated Valve Amplifier


Icon Audio ST40 MKI was the company's first design in 2001 and has always been a special product to them. Since that time, Icon Audio have substantially improved it over the years and its latest guise, the MK IV has several improvements making it an exceptional value.

Headphone Socket
Following customer feedback the new model now features a headphone socket giving greater flexibility of use.

Improved Power Supply
In conjunction with the re-designed output transformers, the Ultralinear Power is now over 50 Watts. This gives greater instantaneous power available for heavy transients, and a more solid bass.

Redesigned Driver Circuit
Using a “cascode” configuration for the first stage enables Icon Audio to use the venerable 6SN7 valve for all the driver circuit functions. This gives better definition whilst improving the frequency response at lower volumes. This also simplifies valve replacement as the amplifier only uses two valve types. Since too much feedback can spoil the sound of an amplifier, only a small amount is used in the Stereo 40 MK IV.

Choke Regulated Power Supply
Working in conjunction with the smoothing capacitors the large choke gives super-smooth power regulation for a silent background. Tertiary Transformers have an extra (third) winding which reduces distortion, using less global feedback. The large handmade output transformers are believed to be amongst the finest available. They are more expensive and difficult to make but worth the effort.

Wide range of valves
The Stereo 40 is designed to work with a wide range of output valves. You can choose between EL34 or KT88 (or even KT66/77/90, 6CA7, 6550). So you can experiment in the future.

Ultralinear or Triode
For sixty years hi-fi fans have argued which sound is better. With the Stereo 40 IV you have the choice of both at the flick of a switch. It is like having two amplifiers in one! Most hi-fi fans prefer the sound of triode operation. A majority of customers use the Triode Facility most of the time therefore this model is upgraded so the Triode power is now 30 Watts enabling use of all but the most inefficient speakers.

6SN7 (CV181)
More relaxed than their miniature cousins, these larger driver valves are the best in their class for their musical sound and longer life. Try the new David Shaw types or new production and vintage USA/Russian types.

Remote Control
HQ ALPS motorised volume pot remote control is useful to get exactly the right volume in your listening position and allows fine adjustment of the right sound level.

Plenty of Power
50 watts of power is enough to fill a medium to large room with a high volume of musical excellence. Icon Audio can offer a range of upgrades including Shuguang “Treasure” valves and Russian types. As well as the superb Jensen “oil in paper” capacitors.


- Class A, all Triode front end
- Circuit: Ultralinear or Triode switchable
- 4x EL34/KT88 matched for best performance
- Valve/phase splitter: 4x 6SN7 (1st stage) 
- Output: 2x 50w per channel Ultralinear
- 2x 30 Watts in Triode mode
- Signal to noise level: -90db
- Freq response: >20hz-20kHz (0, –1dB)
- Power bandwidth: 30Hz-30kHz (-3dB)
- THD: 0.2% at full output

- Input sensitivity: 250/800mv (high/low)
- Silver PTFE audio cable
- Gold plated Input & speaker terminals
- Line inputs: CD, Tuner, Aux plus Tape
- Tape monitor circuit: ‘Record Out’
- Suitable for 4 to 16ohm loudspeakers

- Remote control: HQ ALPS motorised vol
- Solen caps, Jensen copper foil (paper/oil)
- Supplied with valve cover
- Choke regulated power supply
- Custom hand wound Tertiary transformers

- Standby switch: save valve life/power
- Power requirement: 230-240v (117v adj)
- Max Power Consumption: 240W
- Cont Power Consumption: 76-140W min
- Compliance: CE, ROHS and WEEE
- Dimensions (WDH): 390 x 410 x 230mm
- Weight: 22kg

Write a review

Icon Audio Stereo 40 MkIV EL34 Tube Integrated Amplifier

Write a review


29 other products in the same category:


Products availability:

  • Icon Audio Stereo 40 MkIV EL34 Tube Integrated Amplifier

    This product can be ordered and will be shipped within 12 days. Also see the Availability tab and eventual options of the same product.

  • Available for immediate shipping.

    Product is available.
  • This product can be ordered and will be shipped within a certain number of days.

    Product is available to be ordered and will be shipped within the specified days.
  • This product is out of stock. The product is not available to be ordered. It could be incoming and to be email informed when it will be available for ordering, please click on "Email me when available" or contact us.

If a product is available an insufficient quantity, the system will not let you finalize the order, so in this case please contact us to know the future date when more quantities will be available.
Product availability is real-time updated and correspond to our actual stock quantities (Green) or to estimated obtainability times (Blue); in the case of (Blue) products, although the specified times are a realistic and conservative estimate, have to be intended as indicative and not as a binding obligation.

If you place an order containing both readily available products (Green) together with products that will make available within the indicated number of days (Blue), will be shipped alltogether when all product types are into our wharehouse; if you’d like we immediately ship the in-stock articles, it’s better that you place a separate order, or contact us.

When your order is shipped, we send you an email containing all details to track it.

For any further information please contact the Customer Service, available from monday to friday (hours: 9-13 / 15-17).