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Old 30th April 2013, 11:14 PM   #1821
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0.5A pr Device, and 2 pairs? what rail voltage? i see you use 10.080" profiles from heatsinksUSA. 6" long?
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Old 30th April 2013, 11:16 PM   #1822
a.wayne is offline a.wayne  United States
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OK so I didn't build it , but thanks to the extreme generosity of a fellow member I have been listening to this for a few hours. Fairchild outputs. I simply put the boards in place of my f5 boards, set the bias and sat back to listen. WOW... At first I had the bias set very conservatively, but at .5 amp per device this thing really sings. As the name implies it sounds like my f5 only on steroids. I will be adding the diodes to this build tomorrow and will report any difference. As it stands, after running a few hours, the output fets seem to have settled at 56c and the sinks are 48c. I attached some pics...don't laugh..
Evan

55 47
Is the sound better with the diodes ...?
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Old 30th April 2013, 11:28 PM   #1823
evanc is offline evanc  United States
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AudioSan... +/- 21.6 volts .5 amp per device. 4 p and 4 n per channel. yes heat sink usa 10.08 at 7"

a.wayne.. Diodes will be in tomorrw I'll report then.
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Old 30th April 2013, 11:33 PM   #1824
evanc is offline evanc  United States
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The +/-21.6 volts is under load. The other four outputs are facing down and hard to see in the picture.
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Old 1st May 2013, 12:17 AM   #1825
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aha. so so 4*0.5A pr sink?
2*22V *2= 88W pr sink. the reason i ask is that i'm going to use those sinks for F5turbo v3 mono's. 2 pr side.
my numbers are 51V rails. 2.5A bias. so 51*2.5*2=255W dissipation pr Block/4sinks= 63.5W. it looks like it can run Nice and cool. heck. i have to up the bias
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Old 1st May 2013, 12:27 AM   #1826
evanc is offline evanc  United States
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I also have 8 10"pieces coming to build a pair of monoblocks.
The set up pictured is temporary, and will probably drop a few degrees when I put the chassis together and get the sinks off the piece of plywood there sitting on.
I'm also not against thermostatically controlled fans sitting on the heatsinks.
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Old 1st May 2013, 01:07 AM   #1827
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i know. i have 4*10.080" profiles now for a steroid F5 stereo amp. that dissipates 85W pr ch. but not all of the sinks are effective. i was allways thinking that about half the sinks was effective. wich your numbers back up.
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Old 4th May 2013, 01:11 AM   #1828
Rixsta is offline Rixsta  United Kingdom
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Is there any need modify any parts as im using the irfp pair? Instead of original mosfets.
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Old 4th May 2013, 04:42 AM   #1829
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i know. i have 4*10.080" profiles now for a steroid F5 stereo amp. that dissipates 85W pr ch. but not all of the sinks are effective. i was allways thinking that about half the sinks was effective. wich your numbers back up.
I was thinking of trying just 2 for a stereo and if they don't do the job, I can all ways go back and reconstruct the setup.
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Old 6th May 2013, 02:46 AM   #1830
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Does k170 and j74 have to have their Idss closely matched or not really?

Thanks
Daniel
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