Anybody built an Aleph 3/30 with unmatched Mosfets?

[haziz]

I am doing my first Pass labs DIY project and am a bit of a newbie overall. My only prior exposure being a Gainclone and a commercial tube amp kit.

Do I have to bother with matching the Mosfets in the Aleph 3/30 clone based on the Grey Rollins/Brian Bell PCB or can I just do my first iteration of the amp with unmatched Mosfets. I did email Digikey asking them to send me if possible Mosfets from the same manufacture code batch, but have not heard from them.
I will do it unmatched if people have gotten decent results with unmatched. The original Grey Rollins posts suggested unmatched was OK at least in the Aleph Mini.

I am planning on doing this as a first iteration then possibly having a second go with a bigger toroidal, bigger caps and probably matched Mosfets if I like what I hear, however this may end up being too much work doing the amp twice. I did get 2 sets of PCBs.

Any commercial or DIY source of matched Mosfets or does any member of this board want to sell me matched Mosfets?

Any ideas regarding premade cases with serious heatsinks? My hardware and case skills are pitiful.

Thanks.

Sincerely,

Hany.

[Nelson Pass]

Match the mosfets. It isn't that much effort, and it will
avoid possible problems.

[batee]

I bought my matched mosfets from this guy:

http://tech-diy.com/hexfets.htm

I built an A30 out of them and it's working fine. Think I ended up paying about $52 shipped for all FETs (matched and nonmatched) required for two channels of A30.

Bryan A. Thompson
bryan@batee.com

[Cloth Ears]

Originally posted by batee
I bought my matched mosfets from this guy:

http://tech-diy.com/hexfets.htm

I built an A30 out of them and it's working fine. Think I ended up paying about $52 shipped for all FETs (matched and nonmatched) required for two channels of A30.

Bryan, thanks for the tip. Even with shipping to Australia, this will probably be cheaper than buying locally - and I get them matched! Much appreciated.

Originally posted by Nelson Pass
Match the mosfets. It isn't that much effort, and it will
avoid possible problems.

Nelson, the site above solved my problem. That is, having to buy a few extra in order to match successfully, or buying enough for the amp and regulation and using the best-matched for the amp and the rest for regulation.
Now I can buy matched pairs (or matched quads) and use them in each channel without having to expend extra effort.
Oh, the crosses we have to bear by being both cheap and lazy...

[batee]

Also: If you're wanting to match yourself and just want to buy a bunch from the same lot, buy them straight from http://www.irf.com .

Bryan

[Luke]

I didnt know you can buy direct from IRF, but they dont seem to do the IRFP240 or 244 anymore?

[batee]

OK, so in the last couple of weeks, they appear to have been sold to Vishay.

"This product has been divested. Please continue your search of IR's comprehensive product line for solutions that fit your needs."

They link to www.vishay.com.

Oh well - I never really liked them anyway.

Bryan

[doggy]

I also got my mosfets from tech.diy. I got mached triplets. for my A30; this amp is my 1st class a. and I am using it as my main amp.

I have also received the irfp240, 9240 for the F4 amp; I was going with matched triplets-the parallel devices and tech.diy sent me matched six! of each. Imho Tech.diy give very good service.