background image

*See engineers notes at rear

  

 

Page 

9 Guarantee 

 

Thank you for purchasing one of our amplifiers. We 
trust 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 ten 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 your dealer. 
 
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 24 hours 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 from damage 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. 

 

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

  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 is 

desirable due to the high unit value. 

 

 

icon 

Audio

 

UK LTD

 

351 Aylestone Road Leicester  LE2 8TA 

www.iconaudio.co.uk 

Phone +44 (0) 116 244 0593  

Cell +44 (0) 778 715 8791 

Email: sales@iconaudio.com 

2014-08-28 G version 

 
 

 

 

Summary of Contents for MB30m

Page 1: ...out anything please contact your dealer or one of our team Valve amplifiers do need a little more attention than their solid state counterparts but the sonic results are well worth it In this manual we have tried 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 The MB30m is a Single Ended one output valve triode UL power...

Page 2: ...libration ma Run min 10 hour test Check input Output Valve Bias level v Sound Quality Channel Balance Valve Microphony Valve Seating Hum level L R mv RF Test LED brightness Serial No sticker and recorded Mains voltage 110 120 230 240V IEC Mains Fuse A Soft Start Fitted N A Sales invoice Bottom label Credit card receipt Customer survey form Bias meter Transformer Protection N A Upgrades Output valv...

Page 3: ...sensitive to noise so therefore may be placed close to each other similar to a conventional power amplifier Or alternatively place adjacent to each loudspeaker in order to keep the loudspeaker cable to a minimum They should be placed on a flat surface to allow a gap underneath to aid ventilation ...

Page 4: ...eutral terminal and Green Yellow to Earth terminal 6 SWITCH ON The meter should light up and a visible glow may be seen inside the valves when viewed from certain angles After about one minute the amplifier should now be working With the pre amp volume control set to minimum there should be no sound coming from the speakers except a barely discernible hum If there are any unpleasant sounds coming ...

Page 5: ...t of phase with the sound stage inside out with reduced bass If you are unable to check this or confirm the polarity e g if you have built in wiring a test disc will be helpful If you are bi wiring you can independently use either 4 or 8 ohms for the bass and treble Many modern smaller speakers use a 4 ohm unit If in doubt the heaviest base is the best match depending upon preference and again 4 o...

Page 6: ...gher volumes may be because one of the KT120 valves failing A symptom of this could be unable to bias properly Refer to an engineer or to Icon Audio 3 Hum Problems If you experience hum try disconnecting the input if it clears it is NOT the amplifier but some cause external to the MB30m and further advice should be sought from your dealer or Icon Audio By elimination find out which unit is causing...

Page 7: ...d box with a note detailing the problem which valves you suspect and your contact details We will then contact you with the test results Possible visible valve faults Not all valve faults are visible but KT120s 6SN7s and GZ34s valves should not be used if 1 The silver getter material has turned white or is disappearing air leak 2 The valve rattles excessively a slight rattle is normal 3 There are ...

Page 8: ...lease contact us first 8 Specification Features 100 Pure Class A output power Class A all Triode front end KT120 60w beam pentode output valve 6SN7 CV181 double triodes 1st stage valve Valve rectifier GZ34 5AR4 Output power Triode 16w 11 35v 8 Ohms Ultralinear 27w 14 7v 8 Ohm Oversized choke regulated power supply for both driver and output stage Our own unique designed tertiary wound output trans...

Page 9: ...omestic 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 from damage during transit Please do not write on box but use removable...

Page 10: ...istor of around 5 10KΩ will speed this up and check that the HT voltage has discharged Amplifier dead Check the 20mm mains fuse in the IEC socket at rear of the amplifier if dead there is a spare included Or the fuse in the plug if applicable If not either check in line power switch fuse adjacent to IEC socket 230v to 115v Conversion Take the precautions as above It is necessary to change the prim...

Reviews: