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Page 9 

9 Guarantee 

 

Thank  you  for  purchasing  one  of  our  amplifiers.  We 
hope you will be pleased with it. 
 

This  amplifier  is  guaranteed  by  the  dealer  you 
purchased  from  for  12  months  from  the  date  of 
purchase  for  parts  and  labour,  excluding 
shipping.  Valves  are  consumables  and  therefore 
on  a  12  months  pro-rata  basis.  Please  keep  your 
receipt as proof of purchase, this will be needed.  

 
All units are individually tested for performance for at 
least six hours before despatch to you. In the unlikely 
event  that  you  believe  the  unit  is  not  functioning 
correctly,  it  may  be  helpful  to  contact  us  first  as  we 
may  be  able  to  assist  you.  Then  we  would  request 
that you return the item to us for further action. 
 
You  are  advised  to  inform  us  of  any  change  of 
address or change of ownership in order that we may 
keep  you  up  to  date  of  any  upgrades  or 
improvements. Check our website. 
 

Exclusions 

Claims for any damage to  either amplifiers or valves 
must be reported within three days of receipt. 
 
This  amplifier  is  designed  for  normal  domestic  hi  fi 
use.  It  is  not  guaranteed  for  commercial,  Public 
Address  use,  or  use  in  other  situations.  The 

guarantee  becomes  void  if  the  unit  has  been 
modified in any way not approved by Icon Audio. 
 

10 Packing Instructions 

It is essential that the original box and packing be 
kept  in  good  condition,  as  this  provides  vital 
protection  during  transit.  Please  do  not  write  on 
box, but  use  removable  labels. 

Should the original 

box  and  packaging  be  lost  or  become  unusable  a 
repacking  charge  of  one  hundred  pounds  will  be 
made.  

 

Re-use  the  supplied  plastic  bag  to  keep  the 
amp clean and free from damp. 

 

The  mains  lead  fits  in  a  foam  cut-out 
underneath the amplifier. 

 

Insert the piece of cardboard between the 
transformer  cover  and  the  valve  guard; 
this  will  prevent  transformer  damage  to 
paintwork during shipping. 

 

Valves  should  be  removed,  numbered  and 
packed  in  “Bubblewrap”  or  similar  for 
protection inside the valve cover.  

 

If  the  amplifier  is  stored  in  the  box,  keep 
upright. 

 

Do  not  store  in  damp  conditions  as  the 
transformer windings will corrode. 

 

If  the  amplifiers  are  shipped  insurance  id 
desirable due to the high unit value. 

 

 

icon Audio 

UK LTD

 

351 Aylestone Road Leicester  LE2 8TA 

www.iconaudio.com 

Phone +44 (0) 116 244 0593 Cell +44 (0) 778 715 8791 

Fax 0116 244 0593 

2020-02-19 G version 

 
 
 

Summary of Contents for MB 150

Page 1: ...ied to include everything that you need to know Please let us know if you find any errors or feel that we have missed anything out Hi fi reproduction is a long chain of events that includes the recording editing mixing etc before being transferred to a medium such as LP Digital etc before being played through your own source unit the amplifier and finally loudspeakers Your room acoustics will affe...

Page 2: ...un min 6 hour test Check input Output Valve Bias level v Sound Quality Channel Balance Valve Microphony Valve Seating Hum level mv RF Test LED brightness Serial No sticker and recorded Mains voltage 110 230 240V IEC Mains Fuse A Soft Start Fitted Sales invoice Bottom label Credit card receipt Customer survey form Bias meter Transformer Protection Upgrades HT delay fitted N A Output valves 1st Stag...

Page 3: ...Page 3 INSERTION OF VALVES IN MB150s DO NOT REPLACE OR CHANGE ROUND KT120 WITHOUT RE BIASING USE SUPPLIED METER DAMAGE AND POOR PERFORMANCE COULD RESULT USE ONLY KT120 KT150 and 6SN7 6N8P CV181 ...

Page 4: ...s to warm up and then push the standby switch into the down position You will hear a whumm sound The amplifier should now be working All valves should have a visible orange glow from the cathode heaters With the pre amp volume control set to minimum or nothing connected there should be no sound coming from the speakers except a barely discernable hum If there are any unpleasant sounds coming from ...

Page 5: ...n wiring try the following Connect the system up and play some music with plenty of bass e g dance music preferably in mono FM tuners are usually switchable to mono and stand the speakers close together If correct you should hear plenty of bass if not reverse the terminals for one channel only either at the amp or speaker You will now hear more or less bass The higher bass output is the correct se...

Page 6: ... help or Icon Audio Replacements should be 3 Amp anti surge The fuse in the wall plug should be a 3 or 5 amp fuse although unlikely to fail this should be checked if the amplifier fuse is OK No sound Have you selected the right input Is the Tape Monitor switch up Are all the connections OK Is everything switched on Are the speakers connected Distorted sound Could be your source the speakers or the...

Page 7: ...king the earth connection 3 Checking Bias You should get a reading of ideally 180mV if each valve is conducting correctly But variations from about 160mV to 200mV will have little effect Bear in mind that your mains voltage fluctuations can affect your readings by up to 10 So if all the valves are reading slightly high or slightly low this usually means this is due to your mains In this case no ad...

Page 8: ...e than a barely detectable hum from the speakers and the amplifier should sound OK when tested 6 If you cannot set up 180mv bias then the valve is probably faulty or is unsuitable if the reading is zero the individual fuse may be blown If the valves are brand new you will need to check again after approximately 10 100 hours after that only occasionally or if you suspect a problem 7 To avoid damage...

Page 9: ...guaranteed for commercial Public Address use or use in other situations The guarantee becomes void if the unit has been modified in any way not approved by Icon Audio 10 Packing Instructions It is essential that the original box and packing be kept in good condition as this provides vital protection during transit Please do not write on box but use removable labels Should the original box and pack...

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