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Old 1st April 2009, 07:09 PM   #1
manina is offline manina  Germany
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Default PPI A600 improvement

I have a PPI A600 that is being upgraded. New caps, new op-amp and few more tweaks in the pre section.

I have been told that replacing the 6 IRFZ44 with 4 IFR3205 will have positive impact on the sound quality. Is this true? Why?

Thanks
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Old 1st April 2009, 08:45 PM   #2
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Changing the power supply FETs isn't likely to have any audible effect. The Z44s can do everything the amp needs them to do. The original transistors were likely 25 amp FETs (RFP25N05s?). The Z44s are 50 amp FETs.
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Old 2nd April 2009, 06:38 PM   #3
manina is offline manina  Germany
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Thanks Perry.

My 600.2 has the 44 when I purchased it. So, reducing the number of transistors from 6 to 4 has no real benefit to some parameters like distortion?
In this case, money saved
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Old 2nd April 2009, 06:42 PM   #4
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Until you drive the amp to clipping, there won't be any audible distortion.

The A600s that I've seen all had 8 power supply FETs. Does yours have only 6?

Did someone tell you to use less than the original number of FETs?
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Old 2nd April 2009, 06:48 PM   #5
manina is offline manina  Germany
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Sorry - I mixed up the numbers

It's a 600.2 and has 5 per side

And I was told to use 4 per side (totalling 8 instead of 10)
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Old 2nd April 2009, 07:04 PM   #6
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If there is a place for 10, use 10.
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Old 2nd April 2009, 07:10 PM   #7
manina is offline manina  Germany
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ok - got it
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Old 3rd April 2009, 03:16 AM   #8
ppia600 is offline ppia600  United States
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10 to220's = better heat dissipation than 8 =
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Don't worry... you can always turn the gain down!
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