You might want to check out the AEX article since it deals with a very different and supposedly arcane topology. Nelson claims it produces the same specs as a triode amp. No one is doing those so it might be interesting.

I don't know what your goal here might be, but I've built 3 of these
and will probabaly do a few more. Maybe I can bring one up to GPAF
now that I've moved to Houston.

This would be a great project for first time builders, particularly
with a PCB such as Brian Bell's. I think Manualblock used his. I've
also used Scott Nixon's, but Brian's is a bit easier. There's also
a great manual .pdf. I probably won't participate in this one, but
will watch and be happy to help.

Off thread, my HT room with 4 Studio 2 Pi's and 1 Studio 1 Pi is
now sounding fairly good. I hung rugs from IKEA on the sidewalls
and it's much nicer. I'm using the Yamaha receiver recently reviewed
in Absolute Sound, about $400, and it does a good job of time
correction between the too-close speakers.

Skip Pack

• Chip Amp

I think a group build of a chip amp is a great idea. Simple enough for everyone. Amazing performance for the project price. And if everybody on this board has one, it provides a standard to compare other components such as pre, source and speakers.

One suggestion though. My experience shows that the chips are one of the least expensive parts of this project. About $6 each for a single unit at Digikey. A group buy on these would not save much money (saving of $2 to $4 per stereo amp). Transformer and (nice) chassis accounts for most of the cost. A group buy on these two items would have a bigger impact. Also might consider a group buy on high quality output caps too.

gar.