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#1 |
diyAudio Member
Join Date: Jul 2005
Location: christchurch
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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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gongbloom |
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#2 |
diyAudio Member
Join Date: Jul 2005
Location: christchurch
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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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gongbloom |
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#3 |
Official Court Jester
diyAudio Member
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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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#4 |
diyAudio Member
Join Date: Jul 2005
Location: christchurch
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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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gongbloom |
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#5 |
diyAudio Member
Join Date: Jul 2005
Location: christchurch
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here is an internal picture of the amp
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gongbloom |
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#6 |
Official Court Jester
diyAudio Member
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huh - that's surprise ..... completely different ....
anyway - this is schematic of IA125 , output section
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#7 |
diyAudio Member
Join Date: Jul 2005
Location: christchurch
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here is the schematic for those who may be interested
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gongbloom |
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#8 |
diyAudio Member
Join Date: Nov 2013
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Thanks, it´s very usefull to me.
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#9 |
diyAudio Member
Join Date: Mar 2017
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Hello, I just walked in your community for a problem to my Magnum IA120 amplifier, the mine has a different scheme and the chipset broken, you can know the name of this chip because I can not read the letters. Thank you
vincenzo P.S. I can not insert a photo of the interior of the amp https://www.facebook.com/photo.php?f...type=3&theater Last edited by Lamvi62; 15th March 2017 at 06:56 AM. |
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#10 |
diyAudio Member
Join Date: Mar 2017
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