aleph 2 progress

[MEGA-amp]

I am close to finishing one side of a monoblock for my aleph 2's.
12"H x 19.5" W x 2.28" Fin height. I am contemplating changing the design to an Aleph 1.2, I think the heatsinks may be big enough. Your thoughts?


JH

[MEGA-amp]

steel construction

[MEGA-amp]

HUGE!!!!

[moe29]

i think those sinks will have a hard time dissipating 300 watts...

From looking at the Aleph 1.2 service manual it looks like about
346 sq. in. of heat sink for 1 channel.

You've got 234 sq. in. with 2 heatsinks. If you could add another
heatsink like you're using, it would work for 1 ch of Aleph 1.2

[MEGA-amp]

To be honest i've never listened to a Class A amp, so I dont know what 100W will do. From what i've read and followed here on the forum, i believe it will be fine. The only thing i have to compare to is an old pionner sx-1280 which is 185W@8. Just wondering if its possible to move up. Once its built i'm sure replacing fets would become bothersome if i chose to go to 1.2.


I think i'll keep it the way it is, just flirtin with the idea. Moe, I saw your Alpeh 2, great work, are you happy with the sound of it

The above pics, depict just one side of a single monoblock, total heatsink area per channel is 468 sq. in.
Thanks,

JH

[MEGA-amp]

The stock Aleph 1.2 has 346 sq. in. of heatsink per channel. I have 468 sq. in. per channel. I believe I should be fine going up to Aleph 1.2. Would anybody object to that?

Many thanks,
JH

[kilowattski]

Mega-Amp,

Just a question out of curiosity. Why didn't you use a piece of longer aluminum L bracket to connect your heatsinks together? The aluminum bracket can also be cut easily on a woodworking power chop saw with a carbide tip blade. I was also curious why you drilled all the way through the heatsink instead of most of the way and tapping the holes? Then you wouldn't see the holes in the heatsink. Was it because the heatsink base was only about .25" thick? Just curious. Keep up the good work and show us more pictures as you go along.

[Netlist]

Originally posted by MEGA-amp
steel construction

Compared with your feet your sinks look huge

Keep them coming

[Mark A. Gulbrandsen]

According to M&M Metals specs my heat sinks are 103 sq inches per inch of extrusion of which each is 6" long. I have 6 sinks per Aleph 2 and this gives me a total of 3709 sq inches of heatsink if I'm calculating this corectly.
6.250 X 6.250 X 0.500 Base thickness and weighs 7.550 per foot. Rated at 0.6 deg C/W

[moe29]

JH,

I wasn't counting the fin size into the sq. in. formula. Just heatsink
size. Fin size is about the same for your sinks and aleph 1.2

So i still think you're short.

I did notice that the Aleph 1.2 service manual says 500 watts of
dissipation compared to 300 watts for the Aleph 2. Either way it's
a lot of heat to dissipate. Nothing would be worse than spending
the time and money to match 12 fets X 2 for each channel, and
then have the amp run too hot!

but maybe i'm not being enough of a Fearless DIYer