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Old 4th February 2013, 08:21 PM   #161
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Join Date: Feb 2009
that seams about right. the sink kan handle much more then heatsinkUSA says.
i used 12" long. 4pc pr monoblock. and hey was at about 45C with 23C ambient.
no worries

just make sure you massure around 500mV across each source resistor.
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Old 17th October 2013, 04:05 PM   #162
wlowes is offline wlowes  Canada
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Location: Toronto
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Default How do they sound fully broken in?

Originally Posted by Bakmeel View Post
The pleasure was fully mutual.... Thanks for all the help and great responses... Off to the next project (whatever that will be)
Beautiful job. A work of art with great community collaboration. DIY movement at its best.

Are you happy with the sound after they settled in?
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Old 19th October 2013, 12:46 PM   #163
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Join Date: Jun 2008
Location: HaiPhong
Originally Posted by kop89 View Post
I have just finished one monoblock of my Aleph 2. It makes good sound, but I am wondering whether there is something wrong with my build. I was expecting the heatsink to be scorching hot, but turning the amp on for more than 1 hour and measuring the temperature at one of the MOSFETs mounting bolt, it settles at only 56.7 degree C (around 20C ambient). The heatsinks are only warm and I can put my hands on the heatsinks forever.

My heatsink is the 10.080" profile from HeatsinkUSA:
10.080" - HeatsinkUSA, LLC Store

I am using 4 pieces of 9 inch long section per monoblock (3 MOSFET mounted on each 9 inch piece). It is guesstimated at 0.80 C/W/3 inch. So theoretically my setup is around 0.80/(4x3 inches) = 0.067 C/W.

More info on the build:
1kVA trafo
16 x 15000 uF electrolytics (2.7 mH inductor)
Power supply output at 50V
IRFP244 matched within 10mV
Parts BOM per kk-pcb (Pass Labs ALEPH-2 DIY amplifier PCB)

Maybe I should not worry about all these and just enjoy it.
firt ..did you build up a amplifier? or you think that you build up a radiator .
just check bias & AC gain ...and then enjoy it 01 week .. and then open it ... modify .. enjoy it... and then open it ... that DIY get fun.
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