icon Audio MB 805 SE Instruction Manual Download Page 9

*See engineers notes at rear

 

 

 

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  wear 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. 
Please contact us. 
 

10 Packing Instructions 

It is essential that the original box and packing be 
kept  in  good  condition,  as  this  provides  vital 
protection  during  transit,  so  will  be  needed  for 
service  etc..  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. 

 

Send  the  valve  covers  and  valves  in  the 
separate  supplied  box.  See  above  for 
valve removal. 

 

Valves  should  be  removed,  numbered  and 
pac

ked  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  is 
desirable due to the high unit value. 

 

 

icon Audio

 

UK LTD

 

351 Aylestone Road Leicester  LE2 8TA 

Email[email protected]   Website: www.iconaudio.com 

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

2019-11-18 G version 

 
 

Summary of Contents for MB 805 SE

Page 1: ...ve 805 has to do all the work of both the up and down parts of the waveform In order to go down the valve must be running at 100 of its maximum power unlike push pull amplifiers where the idle current...

Page 2: ...mplifier finish Internal wiring check Check Triode mode N A Run min 6 hour test Check input Output Valve Bias level v Sound Quality Channel Balance Valve Microphony Valve Seating Hum level L R mv RF T...

Page 3: ...t rear Page 3 MB805 Layout and Features If you are inserting the MB 805 valve for the first time it may be helpful to observe the slot in the valve base to indicate the degree of rotation needed to fi...

Page 4: ...tral terminal and Green Yellow to Earth terminal 6 SWITCH ON The blue mains indicator should light up The 805s will glow bright yellow You will likely hear a humming noise for a few seconds this is no...

Page 5: ...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...

Page 6: ...valve This could be due a faulty 805 or one of the 805 internal fuses blowing A symptom of this would be no bias voltage at the test point Also the valve would not be as hot as normal Refer to an engi...

Page 7: ...s ground by unscrewing the 0 speaker terminal and tightening the probe in the exposed hole And the red probe in the test socket adjacent to the valve on test Set the Icon meter to 2000mv or the black...

Page 8: ...the mains plug at least 20 minutes beforehand This will enable dangerous voltages to dissipate and the valves to cool down If possible check the bias setting before you attempt to change the valve s i...

Page 9: ...e 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 Please contact us 10...

Page 10: ...or variable transformer will be useful to operate the amplifier on reduced power in order the trace the fault or overload Make sure the bias for the 805s is correct If the AC fuse is blowing with the...

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