Aleph 2 - The Final Build

[Bakmeel]

Originally posted by mosfets
From the wear and tear on the solder pads of your printed circuit boards, will you continue to deploy them or is it time to place new PCB's in the "twin Towers"?

For now I will use them as is. The damage to the pads is not so terrible if you don't need to re-work them anymore. If ever I think these beasts need an upgrade, I will consider a new front-end PCB (with LS disconnection relay implemented).

Today was a sunny day, which wasn't forecast, but I took the opportunity to take a photoshoot on the amps

first pic:

[Bakmeel]

number 2 out of 6:

[Bakmeel]

number 3:

[Bakmeel]

number 4:

It proudly wears the sign "Pass DIY"

[Bakmeel]

number 5:

[Bakmeel]

number 6:

It's beamer metallic paint yeah...

For Dutch fellow DIY-ers with similar wishes, here's the paintshop that did the work: Spuiterij van Gemert (Dordrecht)

[Zen Mod]

what can I say ......

if you're just half good man as your amps are nice and neat ...... then - it was real pleasure messing in this thread

[Bakmeel]

The pleasure was fully mutual.... Thanks for all the help and great responses... Off to the next project (whatever that will be)

[bees]

Originally posted by Bakmeel
The pleasure was fully mutual.... Thanks for all the help and great responses... Off to the next project (whatever that will be)

a turntable PSU... ;-)

converting 230V +-50Hz to 230V 50Hz and or 67,5hz

[kop89]

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.