Built a monster! Need ideas for heatsink!

Duo · 3rd September 2002, 04:16 AM

Hello everybody, I built an amp that I designed and posted in a previous thread. It's supposed to handle almost 600 watts into 4 ohms. It uses a 5Kva power supply and the rails are +-80 volts. I can get up to 50 amps from the thing if I need to. Thing is, at idle, it runs just lukewarm, but when I crank it up a bit, things get hot fast. I know I don't have an adequate heatsink right now, but does anybody have suggestions on the right size to use for a 600W 4ohm amp with six o/t transistors per side??? Also, where's a good place to get heatsinks? I think I'll water cool it to save room later so that'll be easy and small, but I want a heatsink now so I can actually get some power out of this thing without worrying it's going to blow up. You know that a 5kva 160volt supply could produce a real fireworks show right?

Thanks, Duo...

NU_NRG · 3rd September 2002, 04:38 PM

Depending on the o/p type...

if the TO3 type are used I would use a heat tunnel type of heatsink.

May be hard to find but they are worth it!

-Simon

tiroth · 3rd September 2002, 04:50 PM

There are monster sinks on ebay sometimes, often for not much $.

Duo · 3rd September 2002, 10:24 PM

actally, the transistors are TO3P which is a flat pack. They can be mounted on any flat metal surface with a hole in it.... Also, I'm going to upgrade the amp to handle 2000 watts into 1ohm, this will mean 16 transistors per channel just on the outputs, meaning I'll need a huge heatsink...

NU_NRG · 4th September 2002, 02:34 PM

Quote:

I built an amp that I designed and posted in a previous thread

-Duo

Maybe I dunno how to search but i couldn't fimd a tread talking about this mysterious amp of yours, perhaps you could direct me towards it?

-Simon

MRehorst · 4th September 2002, 08:03 PM

I won ebay auction for item #1757246329.
Look it up on ebay to see a picture.
Lots of smooth surface to mount power devices (18"x7.5" if I recall), and pre cut for mounting fans at each end.

The seller sold me an additional unit, and seemed to indicate that he has more of them.

You might want to try emailing him...

MR

Duo · 4th September 2002, 09:23 PM

NU_NRG: Yes, I'll here's a link to the thread, it kinda somehow got lost in the forums.
much less crazy idea

MRehorst · 5th September 2002, 02:30 PM

The previously mentioned heatsinks were delivered yesterday and they are beautiful!

MR

3rd September 2002, 10:24 PM	#4
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	actally, the transistors are TO3P which is a flat pack. They can be mounted on any flat metal surface with a hole in it.... Also, I'm going to upgrade the amp to handle 2000 watts into 1ohm, this will mean 16 transistors per channel just on the outputs, meaning I'll need a huge heatsink... __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

4th September 2002, 08:03 PM	#6
MRehorst diyAudio Member Join Date: May 2002	Possible source for you I won ebay auction for item #1757246329. Look it up on ebay to see a picture. Lots of smooth surface to mount power devices (18"x7.5" if I recall), and pre cut for mounting fans at each end. The seller sold me an additional unit, and seemed to indicate that he has more of them. You might want to try emailing him... MR

4th September 2002, 09:23 PM	#7
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	NU_NRG: Yes, I'll here's a link to the thread, it kinda somehow got lost in the forums. much less crazy idea __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

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3rd September 2002, 04:16 AM	#1
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	Built a monster! Need ideas for heatsink! Hello everybody, I built an amp that I designed and posted in a previous thread. It's supposed to handle almost 600 watts into 4 ohms. It uses a 5Kva power supply and the rails are +-80 volts. I can get up to 50 amps from the thing if I need to. Thing is, at idle, it runs just lukewarm, but when I crank it up a bit, things get hot fast. I know I don't have an adequate heatsink right now, but does anybody have suggestions on the right size to use for a 600W 4ohm amp with six o/t transistors per side??? Also, where's a good place to get heatsinks? I think I'll water cool it to save room later so that'll be easy and small, but I want a heatsink now so I can actually get some power out of this thing without worrying it's going to blow up. You know that a 5kva 160volt supply could produce a real fireworks show right? Thanks, Duo... __________________ -- Duo, W1ngs, VA7MON, and lesser known handles. -- -- http://www.w1ngselectronics.com -- My Work and Projects --

3rd September 2002, 04:38 PM	#2
NU_NRG diyAudio Member Join Date: Dec 2001 Location: Quebec, CANADA	Depending on the o/p type... if the TO3 type are used I would use a heat tunnel type of heatsink. May be hard to find but they are worth it! -Simon

3rd September 2002, 04:50 PM	#3
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	There are monster sinks on ebay sometimes, often for not much $.

5th September 2002, 02:30 PM	#8
MRehorst diyAudio Member Join Date: May 2002	The previously mentioned heatsinks were delivered yesterday and they are beautiful! MR

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