Where do you guys buy your heatsink?

[rgrayton]

I have not researched this, yet, but did not find all that much in a thread search>
BG

[steenoe]

If they are for a chipamp, you could visit the nearest PC-shop and buy a couple of big Athlon heatsinks Thats the cheap and easy way

Steen.

[rgrayton]

You mean like Comp Usa -- an Athlon processor heat sink? I imagine this is a solution for LM3886. OK with 4ohm? What about a briged LM4780? Thanks.
BG

[wxn]

A typical cpu heatsink with fan barely spinning can handle LM3886 running at full power without problems

[steenoe]

What about a briged LM4780?

In that case, a PC heatsink is probably too small. For LM3875 and 3886 they will do. I cant give you advise on bigger heatsinks from the States, maybe someone else can tune in on that? Many have scavenged heatsinks from the junkyard's electronic container, but not all of us are cut for that kind of approach Good luck.

Steen.

[jackinnj]

A bridged LM4780 running full tilt (120 watts) requires a heatsink with C/W of =~ 1.0 . I am running a pair of these -- I used two 12" sinks with 10 fins -- Electronic Surplus in Cleveland carries one which is drilled for several TO3 devices but mine is tapped 6-32 -- i think they cost me about $13 each. the two heat sinks are mounted as a tunnel with a small computer fan blowing around 100 LFM -- pretty quiet.

There is a fellow on EBay who will sell you heatsink stock and cut it by the inch, foot whatever --

[rgrayton]

Steen, thanks for your inputs. I just noticed you were from DK> I was not planning on a fan. Is that what is typically done for a chipamp?
BG

[steenoe]

I was not planning on a fan. Is that what is typically done for a chipamp?

No, a chipamp does not need a fan.
Jackinnj has the answers for you. Ebay is probably the cheapest option. Also have a look at this:Dual CT Transformers with LM3886?

Steen.

Edit. the ones Workingathome is talking about should do fine.

[lgreen]

I have been looking for heatsinks for years in the USA, searching the web endlessly. My results have been very bad, you need to go to ebay to get anything of substantial size. The only other reliable option is Conrad heat sinks in Australia.

Of course you could check surplus places but I assume you were referring to new stock. I've had better luck with surplus stores than on-line searching, for what its worth.