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Old 20th February 2010, 09:28 PM   #1
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Question Magnum IA120 Integrated information

Hi i recently purchased one of the above amplifiers in working condition off trade me but would like to know more about the company ect or even get some service info schematics ect.
judging by the date codes on the devices i would say the amp was manufactured about the middle nineties but have been unable to find any information on the net any help would be greatly apreciated.
Thanks Peter.
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Old 15th March 2010, 08:12 AM   #2
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I have spent some time working out the schematic for this amp and will post it for any one else who may be interested if i am allowed to do so.
However the audition of this amp was rather dissapointing and as i bought it cheaply i will probably use the case transformer and better quality parts to build something new.
Does any one have any suggestions for an AB design of arround 50-60W?
Regards to all.
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Old 15th March 2010, 10:07 AM   #3
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line stage is basically LTP with buffer ;
rest is MC stage with small bjts , few OPs as supply reg for MC stage , two SIP OPs for MM stage , rec buffer OP

power amp is slightly tweaked Hitachi schematic from their Application notes , but with typical Olde England diminutive Iq .

if you're interested - I can post schematic ( power stage is floating already somewhere on DiyA ) , for preamp I need to scan ......

recommendation - leave it as is - you can hardly squeeze anything better sounding in that case/heatsink

or - remove entirely preamp pcb , make decent input selector and attenuator and use just power amp as integrated .

I'm writing all this presuming that your IA120 is similar to IA125 , which I owned somewhere in the past
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Old 16th March 2010, 04:24 AM   #4
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This amp seems somewhat different to the model you describe i would be interested in the schematics you have and would gladly send you a PDF of my schematic if you wish to compare them.
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Old 16th March 2010, 05:09 AM   #5
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here is an internal picture of the amp
Attached Images
File Type: jpg MagnumIA120.jpg (777.2 KB, 214 views)
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Old 16th March 2010, 09:38 AM   #6
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huh - that's surprise ..... completely different ....

anyway - this is schematic of IA125 , output section
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File Type: jpg MAGNUMIA.jpg (51.9 KB, 179 views)
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Old 17th March 2010, 04:37 AM   #7
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here is the schematic for those who may be interested
Attached Files
File Type: pdf Magnum IA12015032010_00000.pdf (92.7 KB, 181 views)
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Old 16th November 2013, 08:42 AM   #8
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Thanks, its very usefull to me.
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