[guest1632]

Hi all,

Don't iknow if this is the place or not, so apologies if not.

I think I've settled on the SKA amp. So, ... any body got any ideas where to get cases? It seems that the left and right sides would have to be cut out for the heatsinks to fit. If I go with the Conrad 3075 heatsink, it's 12 x 3. Unless, someone has any other ideas, I am open to any suggestions.

Regards,
Ray

[audioferret]

Have you checked out this site yet?

http://www.diyenclosures.com/products/chassis/

There are acouple of others out there, but I don't have them in front of me.  For the rear of your amp, try...

http://www.frontpanelexpress.com

[Gordy]

Hey Ray! 

I think Greg has already checked out the diyenclosures offerings, sounds like they are a fit with an aluminum strap to tie the sinks together... http://www.audiocircle.com/index.php?topic=33531.0

Another option would be to build a case around these sinks... http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=11880

[gitarretyp]

I went with the par-metal 20 series for my GB150D with heatsinks sourced from ebay. This place, ATI, has some of the nicer DIY cases i've seen.

[guest1632]

Hey Ray! 

I think Greg has already checked out the diyenclosures offerings, sounds like they are a fit with an aluminum strap to tie the sinks together... http://www.audiocircle.com/index.php?topic=33531.0

Another option would be to build a case around these sinks... http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=11880

Have you checked out this site yet?

http://www.diyenclosures.com/products/chassis/

There are acouple of others out there, but I don't have them in front of me.  For the rear of your amp, try...

http://www.frontpanelexpress.com

Hey Gordy,

If you use the type of heatsink Greg suggests, you need only half per side on a 150D. On the 300D's, his heatsink is roughly 12 long, x 3 high, and about 2 inches deep. The problem is you then have to cut out the left and right sides of the case. So I'll continue to look around and see what I can find. Thanks for the suggestions. I was looking here locally in Tucson to see what there is. The transistors are IRFP9240, with a TO-247 package type. Apparently there isn't a crossreference type I could look for. Just want to see those buggers, so I have a better idea of what to source for.

Ray

[randytsuch]

Hey Gordy,

If you use the type of heatsink Greg suggests, you need only half per side on a 150D. On the 300D's, his heatsink is roughly 12 long, x 3 high, and about 2 inches deep. The problem is you then have to cut out the left and right sides of the case. So I'll continue to look around and see what I can find. Thanks for the suggestions. I was looking here locally in Tucson to see what there is. The transistors are IRFP9240, with a TO-247 package type. Apparently there isn't a crossreference type I could look for. Just want to see those buggers, so I have a better idea of what to source for.

Ray

I have a pack of IRFP240's in front of me, which are just the opposite polarity of the 9240's (240's are npn).  They look like a TO-220 package, but are wider.  My 240's are 5/8 inch wide, I think a 220 is 1/2 inch wide.  This makes the lead spacing wider, I think the leads are about 7/16 apart, from pin 1 to 3, probably 2 tenths lead spacing.

These guys have cases with heatsinks
http://eshop.diyclub.biz/index.php?cPath=115_138

I am not sure if that is the exact right link, I am having some trouble opening their pages, it is REALLY slow, but I am not sure if it is something on my end causing it.

Good luck
Randy

[guest1632]

Hey Gordy,

If you use the type of heatsink Greg suggests, you need only half per side on a 150D. On the 300D's, his heatsink is roughly 12 long, x 3 high, and about 2 inches deep. The problem is you then have to cut out the left and right sides of the case. So I'll continue to look around and see what I can find. Thanks for the suggestions. I was looking here locally in Tucson to see what there is. The transistors are IRFP9240, with a TO-247 package type. Apparently there isn't a crossreference type I could look for. Just want to see those buggers, so I have a better idea of what to source for.

Ray

I have a pack of IRFP240's in front of me, which are just the opposite polarity of the 9240's (240's are npn).  They look like a TO-220 package, but are wider.  My 240's are 5/8 inch wide, I think a 220 is 1/2 inch wide.  This makes the lead spacing wider, I think the leads are about 7/16 apart, from pin 1 to 3, probably 2 tenths lead spacing.

These guys have cases with heatsinks
http://eshop.diyclub.biz/index.php?cPath=115_138

I am not sure if that is the exact right link, I am having some trouble opening their pages, it is REALLY slow, but I am not sure if it is something on my end causing it.

Good luck
Randy

Hi Randy,

Nope, not on your end, this site is taking forever to open too.

Ray

[Gordy]

Randy, were you pointing to the M9 chassis?  Looks to be a very nice piece, interior is better than 17x14x5 and includes almost 20 lbs. of heat sink! 




$120.00
Case for M9 with heatsink
Six pieces of heatsink each weight 1.5 Kg
version A with balance and RCA mounting holes
version B only RCA mounting holes
Panel height: 150mm, width: 480mm, thick: 8mm.
internal dimension: 430mm, height: 135mm, width: 360mm.
Color:silver

[randytsuch]

Randy, were you pointing to the M9 chassis?  Looks to be a very nice piece, interior is better than 17x14x5 and includes almost 20 lbs. of heat sink! 

$120.00
Case for M9 with heatsink
Six pieces of heatsink each weight 1.5 Kg
version A with balance and RCA mounting holes
version B only RCA mounting holes
Panel height: 150mm, width: 480mm, thick: 8mm.
internal dimension: 430mm, height: 135mm, width: 360mm.
Color:silver

Hi Gordy
Yeah, that was the one I was trying to find this morning, but there web site was hosed up, so the page would not load.  Website is working now, so you can see it.
This link should take you there
http://eshop.diyclub.biz/product_info.php?cPath=115&products_id=211

I wonder how much shipping is?
I have considered it for a class a amp, but have never pulled the trigger.
It would also be nice to know what the heatsink dimensions are.

Randy

[Gordy]

I wrote to DIYclub asking for the total weight and shipping cost to my zip (east coast US), I'll let you know what I hear from him.

I'm thinking about building Mauro's Evolution, might be a tad overkill for that    but it would be cool for the SKA 300D in 100w A class wouldn't it?  8mm back plate... how do you cut an IEC into that, a water/abrasion knife? 

[amplifierguru]

Well, I don't mid that heatsink from bgmicro -  http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=11880

It has the channels near the side for screwing the chassis on top and bottom and, at 4.25" high, you could mount a whole module flat to the heatsink allowing more internal space. Great price as well.

Trafo in the middle with PSUs  at each side with short runs to the amp modules. 17" x 10" x 4.5" whole amp.

Greg

[guest1632]

Well, I don't mid that heatsink from bgmicro -  http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=11880

It has the channels near the side for screwing the chassis on top and bottom and, at 4.25" high, you could mount a whole module flat to the heatsink allowing more internal space. Great price as well.

Trafo in the middle with PSUs  at each side with short runs to the amp modules. 17" x 10" x 4.5" whole amp.

Greg

Hey Greg,

HS not long enough, if calculations are correct. I however must be missing something here. If each MOSFET requires 1.25 inches, that would mean you'd need 10 inches total spacing, a hair over 1.25 inches apart/between each device. What am I missing here.


Now, maybe that 1.25 inches is from the head where you screw the MOSFET down to the case to the bottom of the device?

Ray

[JoshK]

I wrote to DIYclub asking for the total weight and shipping cost to my zip (east coast US), I'll let you know what I hear from him.

I'm thinking about building Mauro's Evolution, might be a tad overkill for that    but it would be cool for the SKA 300D in 100w A class wouldn't it?  8mm back plate... how do you cut an IEC into that, a water/abrasion knife? 

What is Mauro's Evolution?

[amplifierguru]

Hi Ray,

please see -

http://www.audiocircle.com/index.php?topic=33556.msg319887#msg319887

for my response.

Cheers,
Greg

[Gordy]

Hi Josh, it's a tweeked out Mauro Penasa 3886 current pump...

http://www.diyaudio.com/forums/showthread.php?s=&threadid=54571


http://translate.google.com/translate?hl=en&sl=it&u=http://www.webalice.it/mauro.penasa/&sa=X&oi=translate&resnum=6&ct=result&prev=/search%3Fq%3DMauro%2BPenasa%26hl%3Den%26lr%3D%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3DBzj

[Gordy]

I wonder how much shipping is?

Randy

I just heard back from Johnny at DIYclub, S&H for the M9 chassis to the US would be $165 by EMS and $100 by surface.  He didn't answer my Q about the weight...

[randytsuch]

I just heard back from Johnny at DIYclub, S&H for the M9 chassis to the US would be $165 by EMS and $100 by surface.  He didn't answer my Q about the weight...

$100 for surface shipping.  I figured it would be expensive.  Almost doubles the cost of the case, too bad.

I was at Apex jr yesterday to buy some stuff, I ended up buying a 12 lb. heatsink that is about 10x10 with 3 inch fins.  A serious sink for a class a amp.  Problem is, I need to figure out how to mount it in a chassis.  Having the sinks premounted would be really nice.

Randy

[guest1632]

I just heard back from Johnny at DIYclub, S&H for the M9 chassis to the US would be $165 by EMS and $100 by surface.  He didn't answer my Q about the weight...

$100 for surface shipping.  I figured it would be expensive.  Almost doubles the cost of the case, too bad.

I was at Apex jr yesterday to buy some stuff, I ended up buying a 12 lb. heatsink that is about 10x10 with 3 inch fins.  A serious sink for a class a amp.  Problem is, I need to figure out how to mount it in a chassis.  Having the sinks premounted would be really nice.

Randy

Hi Randy,

Yep! that's a serious HS alright. 10 long, 10 high, and 3 deep. Hmmm, looks like you will have to cut that baby in half, 10x5x3. If it's just aluminum, you will be ok. But if it's other material, you'll have to wear a mask so you don't breathe in any dust from the cut.

Ray

[randytsuch]

Hi Randy,

Yep! that's a serious HS alright. 10 long, 10 high, and 3 deep. Hmmm, looks like you will have to cut that baby in half, 10x5x3. If it's just aluminum, you will be ok. But if it's other material, you'll have to wear a mask so you don't breathe in any dust from the cut.

Ray

Hi Ray,
It is aluminum, and I do plan to cut it in half.  He also had a 8x10x3 heatsink, weighed about 10 lbs.  Luckily I can go there and pick it up, shipping would add a lot to the cost.  I also picked up some pretty hefty transformers that would have been expensive to ship.

Randy

[guest1632]

Hi Randy,

Yep! that's a serious HS alright. 10 long, 10 high, and 3 deep. Hmmm, looks like you will have to cut that baby in half, 10x5x3. If it's just aluminum, you will be ok. But if it's other material, you'll have to wear a mask so you don't breathe in any dust from the cut.

Ray

Hi Ray,
It is aluminum, and I do plan to cut it in half.  He also had a 8x10x3 heatsink, weighed about 10 lbs.  Luckily I can go there and pick it up, shipping would add a lot to the cost.  I also picked up some pretty hefty transformers that would have been expensive to ship.

Randy

Hi Randy,

So to be nosy, what transformers did you get? Just to get an idea how much was that HS you got?

Ray