WANTED! P3A Amp heatsinks!

annex666 · 23rd August 2002, 09:42 PM

This may be a long shot but is anyone out there blessed with two heatsinks that are the right size (and preferably pre-tapped) for 2 P3A boards? [Around 1Deg C per Watt 170mm*80mm]

I would be greatful for any replies - I'm from the UK so preferably no replies from too far away (unless you know some way to post heavy items gravity free!)

Thanks for looking

annex666 · 24th September 2002, 09:18 PM

<center>Anyone???

Please???

Jakeh · 25th September 2002, 11:43 AM

Hi,

If you can't find anything more exactly suitable, I have some heatsinks available. Here's a description I gave to someone else:

"My calculations and comparisons with other heatsinks seem to indicate they'd be more like 1C/W, though. That is conservative actually, as they look pretty identical to the one that is rated at 0.9 or 0.58C/W in the (1997!) RS catalogue I have. They are 150 x 200 mm (the 0.9C/W in RS was/is 125x200, and the 0.58 C/W was/is larger than these). There are 29 fins which run parallel with the short dimension which are 25mm long (actually 21mm ignoring the base thickness). I'd guess at 0.8 C/W or there abouts... They have a threaded hole near each corner (so can easily be turned into square enclosures with a little aluminium angle), and are drilled and tapped (twice) for transistors either side of the midpoint of a line running down the middle. Ideal for flatpacks, but TO-3s would require more drilling or a bracket. My only reservation with them is that they are powder coated (black) rather than anodised, and if they are dropped the coating on the edges of the fins can chip."

A tenner each, I'm in London.

Cheers, Jake

annex666 · 25th September 2002, 07:58 PM

Cheers for the reply - I've been looking for a while now, is there any chance you could post or email me a pic?

...so far they sound interesting for the price, especially considering RS want's something like £25-£45 for this sort of Deg C/Watt

Jakeh · 26th September 2002, 05:57 PM

Sorry, no pics and no way to take any.

Rarkov did a render from the description which I've tried to attach. Pretty damn acccurate, if you can imagine them black!

annex666 · 26th September 2002, 08:47 PM

Cheers for the post - I'm awaiting a pricing from KAU, but I'm expecting it to be huge so I'll probably end up buying them.

I'll post again soon.

Cheers for the render

Rarkov · 27th September 2002, 11:09 AM

Hi,
Sorry - missed the bit about them being black. If anyone is interested - I will redo the render accordingly! Just drop me a mail or post a request here.

Gaz

Mark A. Gulbrandsen · 28th September 2002, 12:18 AM

Yea, for best heat dissipation they should look like this......

Mark

Rarkov · 29th September 2002, 12:10 PM

Hi,
Yep...or you could just reverse the colours! Quicker than how I was going to do it...(Change materials, Environment and re-render!

)

Thanks,
Gaz

annex666 · 3rd October 2002, 06:52 PM

I highly recommend dealing from this guy - I bought two of these heatsinks and paid via PayPal and they were at my house before 9 the next morning!

May I say a pleasure to deal with you - also if you ever have anything else laying around be sure to post on the forum and email me first

.

If anyone has any queries buying goods over this forum I would happily reply emails with regards to the good service I received.

23rd August 2002, 09:42 PM	#1
annex666 diyAudio Member Join Date: Jul 2002 Location: England	WANTED! P3A Amp heatsinks! This may be a long shot but is anyone out there blessed with two heatsinks that are the right size (and preferably pre-tapped) for 2 P3A boards? [Around 1Deg C per Watt 170mm*80mm] I would be greatful for any replies - I'm from the UK so preferably no replies from too far away (unless you know some way to post heavy items gravity free!) Thanks for looking

24th September 2002, 09:18 PM	#2
annex666 diyAudio Member Join Date: Jul 2002 Location: England	<center>Anyone??? Please??? __________________ ...if it ain't broke don't fix it - make it BETTER!

25th September 2002, 11:43 AM	#3
Jakeh diyAudio Member Join Date: Feb 2001	heatsinks Hi, If you can't find anything more exactly suitable, I have some heatsinks available. Here's a description I gave to someone else: "My calculations and comparisons with other heatsinks seem to indicate they'd be more like 1C/W, though. That is conservative actually, as they look pretty identical to the one that is rated at 0.9 or 0.58C/W in the (1997!) RS catalogue I have. They are 150 x 200 mm (the 0.9C/W in RS was/is 125x200, and the 0.58 C/W was/is larger than these). There are 29 fins which run parallel with the short dimension which are 25mm long (actually 21mm ignoring the base thickness). I'd guess at 0.8 C/W or there abouts... They have a threaded hole near each corner (so can easily be turned into square enclosures with a little aluminium angle), and are drilled and tapped (twice) for transistors either side of the midpoint of a line running down the middle. Ideal for flatpacks, but TO-3s would require more drilling or a bracket. My only reservation with them is that they are powder coated (black) rather than anodised, and if they are dropped the coating on the edges of the fins can chip." A tenner each, I'm in London. Cheers, Jake

25th September 2002, 07:58 PM	#4
annex666 diyAudio Member Join Date: Jul 2002 Location: England	Cheers for the reply - I've been looking for a while now, is there any chance you could post or email me a pic? ...so far they sound interesting for the price, especially considering RS want's something like £25-£45 for this sort of Deg C/Watt <center> __________________ ...if it ain't broke don't fix it - make it BETTER!

26th September 2002, 08:47 PM	#6
annex666 diyAudio Member Join Date: Jul 2002 Location: England	Cheers for the post - I'm awaiting a pricing from KAU, but I'm expecting it to be huge so I'll probably end up buying them. I'll post again soon. Cheers for the render __________________ ...if it ain't broke don't fix it - make it BETTER!


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27th September 2002, 11:09 AM	#7
Rarkov diyAudio Member Join Date: Aug 2002 Location: North East, UK	They're black?! Hi, Sorry - missed the bit about them being black. If anyone is interested - I will redo the render accordingly! Just drop me a mail or post a request here. Gaz

29th September 2002, 12:10 PM	#9
Rarkov diyAudio Member Join Date: Aug 2002 Location: North East, UK	Hi, Yep...or you could just reverse the colours! Quicker than how I was going to do it...(Change materials, Environment and re-render! ) Thanks, Gaz

3rd October 2002, 06:52 PM	#10
annex666 diyAudio Member Join Date: Jul 2002 Location: England	I highly recommend dealing from this guy - I bought two of these heatsinks and paid via PayPal and they were at my house before 9 the next morning! May I say a pleasure to deal with you - also if you ever have anything else laying around be sure to post on the forum and email me first . If anyone has any queries buying goods over this forum I would happily reply emails with regards to the good service I received. __________________ ...if it ain't broke don't fix it - make it BETTER!

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