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Icon Audio MB845 MKII M Mono Blocks

code: ICONMB845MKII
£7,083.29 (FREE UK Delivery)
Item out of Stock  |  Usually dispatched within 24 hours
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The RCA 845, probably the ultimate power triode valve dates from about 1931 when the only way to get higher powers was to make valves bigger and run at higher voltages. The later EL34 and KT88 types are far more efficient but many think do not sound as pleasing.

The MB845 MK I has truly become a legend in the UK, but hi fi fans were soon asking if there was more Icon Audio could do to improve the performance. With the MB845 MK II, Icon Audio have used all their expertise to create the ultimate triode PP amplifier. The MB845 MK II has an improved power supply, an upgraded driver stage, more linear driver chokes, and the new series of bigger LDT series of low distortion transformers. These have caused the MB845s to put on 11kg each to 37Kg each, so be careful lifting!
 
Technical Specifications:
  • Improved LDT Tertiary winding output transformer
  • Improved dual 6SN7 high current driver circuit
  • Choke regulated power supply
  • All hand wired point to point
  • No printed circuit board to ‘colour’ sound
  • Class A, all Triode front end
  • 2x 845B precisely matched for best performance
  • 1x 6SL7 first stage gain valves
  • 2x 6SN7 driver valves, choke loaded plates
  • 845 AC heating for max life and max reliability
  • 5V (typical) output at clipping point 8 Ohms*
  • Giving approx 20 Watts of Pure Class A
  • Can be used with passive or active pre-amp
  • 450mv (high) & 1000mv (low) input sensitivity.
  • Signal to noise level -90db* (approx)
  • Hum and noise 0.5mv (low sensitivity)*
  • 6SL7/6SN7 DC heater circuit for minimum hum
  • Freq response -1db points= 6Hz 27khz
  • Freq response -3db points= 6Hz-57kHz
  • Source impedance 0.7Ω (8Ω taps, low sensitivity)
  • Damping factor 13
  • Gain 67 (high) 30 (Low)
  • THD typically less than 0.1% @ 1w. 0.14% @ 8w (1kHz)
  • 4 & 8 ohm loudspeaker taps
  • Custom tertiary hand-wound mains/output transformers
  • Attractive Plexiglass cover included in the price
  • Audiophile quality 2W precision resistors throughout
  • Solen audio capacitors (or optional Jensen Copper foil)
  • Silver PTFE audio cable
  • Gold plated Input & speaker terminals
  • 220/240volts (115 v adjustable)
  • Comprehensive manual supplied
  • Full instructions for DIY valve change included
  • Power consumption: 180w min, (290w max sine wave) each
  • Size in cm W24, D57, H28 mm ( inc cover), 37kg each (Allow space for connections and ventilation)
  • Carton 2x 66x35x38cm + 1x 57x31x32 Total 84kg
  • (Specifications subject to change, errors & omissions excepted. General July 2018)

We endeavour to despatch same day for orders placed up to 2pm on available stock items (items with stock message "Usually dispatched within 24 hours"). Please remember to check with us first for a physical stock check if next day delivery is important to you. Any items with stock message "Usually dispatched within 72 hours" are items that we do not hold in stock but order in from the importer or manufacturer as soon as a customer order is recieved. Occasionally these may be delayed beyond 72 hours due to importer/manufacturer stock levels but we will inform you as soon as we can if this is the case.

UK ORDERS:  We despatch the bulk of our UK mainland items on a 24 hour service – Free of Charge.  Non Mainland locations - Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland may take a day or so longer and are not Free of Charge. Smaller items are delivered using Royal Mail recorded delivery or special delivery. Larger items are delivered using a courier service such as Interlink Express, DPD, UPS or DHL. 

INTERNATIONAL ORDERS: We offer competitive rates which can be confirmed by email. Please just ask – we will need a full delivery address and telephone number. Smaller items are delivered using Royal Mail Small Packets Airmail with International Tracked and/or Signed depending on value of item and availability of the service. Larger International shipments are sent by insured and tracked services using DPD, DHL or UPS. If there are any delays due to specific customs regulations, etc, you will be contacted by Turntableworld or by the courier with a request for any further information required. Customs duties do not apply for shipments into any EU country (for a full list please refer to the EU Country List). Customs duties can apply for countries outside of the EU. Customers in these countries are responsible for all taxes and duties incurred when the items enter their country.

COLLECT IN STORE OR HOME INSTALL:At the request of the manufacturer some items cannot be supplied by mail order but you can click and buy them and then elect to collect them from our store or arrange a home install (if applicable). Applicable items clearly state that they are Collect in store or home install. Once ordered you will receive a message prompting you to contact us by phone or email to arrange for us to deliver and install or to reserve and collect from our store at your convenience, you will also be advised of the delivery time / stock availability as not all Home install / collect in store items are held in stock. 

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