musical angel modified marantz 7 preamp schematics - diyAudio
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Old 16th May 2006, 08:11 PM   #1
rchung is offline rchung  United States
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Join Date: Mar 2004
Location: carlsbad, CA
Default musical angel modified marantz 7 preamp schematics

Hi All,

Recently, one channel of my relatively new modified marantz M7 preamp broke. I wondered if anyone has a schematic on this amp made by musical angel, which was frequently listed in Ebay. I have a jpeg which is very hard to read and I could not get the supplier to put up a better one.

Any suggestion on modding this amp for better performance while I am repairing it.

It started out very static-ky and then no more sound, just some hum. on the left channel.

Any help is appreciated.

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Old 16th May 2006, 11:58 PM   #2
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Join Date: Nov 2002
Is there a chance that you could draw out the schematic and list the tubes ? I can't make out the schematic you posted.
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Old 17th May 2006, 12:08 AM   #3
rchung is offline rchung  United States
diyAudio Member
Join Date: Mar 2004
Location: carlsbad, CA
Default jpeg schematics

Unfortunately, that is all they gave me on the ebay listing. I know the tube should be 12AX7 and the rectifier tube should be the standard type. I would try to trace that out when I have time. it would be at least a couple days before I can find time to get to it.

I found this one from a website and I wondered if it is similar.
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