Whatever you do, try not to buy nrew ones, they can be ridiculosly expensive!  I found that out the hard way.

There are plenty of places to find used heatsinks.  The first place I would look is Mendelson's, http://www.meci.com, thier stock varies by week to week, but they almost always have something.  I would do a google search for Surplus Electrical Sales also, I have scrounged many heatsinks from large power supplies and regulators I have bought online and at local electrical surplus stores, most larger cities will have one.

My last big project, my 100 WPC solid state amp build, I removed the heatsinks from some regulator assemblies I bought for $5 each, and each assembly held a pair of large heatsinks, I used 4 on my amp.  BTW, the cost new for those heatsinks from a wholesaler was like $80 each(!) if I would have bought them new.....

Hope this helps...

i'll take your word and not buy new...i'll keep a look out on that site for some...

i forgot all about the local hi-fi shop...i should get down there and see if they have any extra laying around i could buy...i am sure the guy does...he's got eevrything!

but X-over that'd be great, if you find anything let me know

sweet

i was just looking at some of the gainclones people have done...and some are crazy!  some cases look like full productiong high end stuff

i might have a heatsink figured out but it's still only a possibility, still let me know guys...

now i have to figure out the power supply...shouldn't be too hard...i just need to find the right transformer

http://diyaudioprojects.com/Chip/LM3886_CA/LM3886_CA.htm
that is what i am going to start building...there are kits to buy...i still have to figure out what i am doing with it for sure...heatsink and transformer is what i am most concerned about...not sure if i will use two smaller transormers for each mono or use one larger for both

i'll have to start a project log here sometime soon when i actually start building!  it'll be too cold here to work on the car so i move inside

maybe you should make your own heat sink.  find a hunk of aluminum or something and mold it into a shape/design you'd like.  that could be fun if you have the tools.

I'm not trying to talk you into building one, but if you are careful and pay heed to high voltages, you can check voltages/bias etc, with a tube amp and not get tagged.

What Mike I think kinda means is with a tube amp circuit, a guy can slip a test lead or probe and not really damage anything. Provided it isn't some insane high voltage, then one shouldn't be probing around in there anyway....or do it in a different manner.
Tubes are tough.

With a solid state state circuit, you have to be really careful when checking voltages, etc...you slip a lead or probe and Poof! There goes your driver circuit up in smoke. And depending how it is coupled to the output circuit, you could smoke that as well.
Transistors don't like to be shorted. And there is enough current in a SS circuit to zap one pretty good.

I dunno if the gain clone power operational amplifier has a internal safety circuit to prevent it from shorts/overvoltage.

This is why a rank amatuer like me sticks with tube circuits, I can get dumb and not really destroy anything.

However, I always wanted to build some sort of Class A SS amp, like a Aleph or something.

Good luck.

i will eventually do some tube building, i just have my mind set on the gainclone, i have been doing a lot of work with op amps in school right now...so it is right up my alley in terms a what is going on in school...i took a look at the Son of Zen amplifier...looks like another doable project, so do some tube projects...lol i have a bunch of stuff i want to do, so stop showing me more! lol i will eventually get to tubes and Transistor and mosfet amplifiers...we'll see how things go with this project first