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Post by d0lph1n on Sept 28, 2008 9:40:13 GMT
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Sept 28, 2008 12:30:59 GMT
Can't tell from the board pics but typically the DC offset trimpot (if one is provided) will be in the front end circuit or if one is present in the DC Servo circuit. You may have TWO trimpots per channel (or one or none) on board.One the above and the other an output stage bias control to set the quiesent current levels (how high into Class-A the amp operates) so be sure you get the right one.The bias adjust will normally be in the output stage driver circuit so fairly easy to recognise by where on the pcb it is located Front end-DC Balance Output section-Bias *BTW the two may interact so go with caution.Bias too high and you may burn up your amp  |
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Post by d0lph1n on Sept 28, 2008 15:28:15 GMT
Thanks rickcr42. I've been trying to get the schematics from dif. forums and directly from MF without success.
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Post by d0lph1n on Sept 28, 2008 15:59:29 GMT
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Post by sometrolls2 on Sept 29, 2008 22:01:41 GMT
Are there other almost identical models that you post service manual request for?
Also check the for clone PCBs, they might have a schematic or an easy to read layout.
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Post by d0lph1n on Oct 1, 2008 5:51:41 GMT
Are there other almost identical models that you post service manual request for? Also check the for clone PCBs, they might have a schematic or an easy to read layout. According to MF, A3.2cr "...uses the complete Nu-Vista M3 power amp circuit, including choke regulation, and all components except, of course, the nuvistors. We've reduced the power relative to the Nu-Vista M3 by about 3dB." Also, it might have a lot in common with A3cr. |
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Oct 1, 2008 16:45:22 GMT
Have MF at least verified that you actually HAVE a DC Balance control in your amp ? seems it isn't asking too much from where I sit  Wish I could be more help  |
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Post by derekrumble on Oct 14, 2008 12:24:20 GMT
Can't help you at all - but thanks for the pics man! Always wanted to peek inside my A3.2cr power amp but havent got the right tools. I love this amp - it's so 'fit-it-and-forget-it'. Derek |
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