Rawson Resale......

4780 is 2 3886's on chip. typically the 2 parts are paralleled to create more power for low imp loads. though can be bridged to but need to run low rail voltage so stable for various loads. audiosector and tech-diy sell 4780 kits. i don't make 4780's since my boards are for 3886 and some for 1875, definitely need fabbed board for 4780. plus need to electrically insulate from heatsink. in general easy enough for me to just put two 3886 together myself. lastly, find single 3886 works well enough and only need multichip parallel if driving tough load - in which case you might want to consider a different type of amp to begin with.

Thaks, Tim.....would you characterize the 4780 as a sonic upgrade or basically the same sound?

I have used one of Tim's amps for awhile, and am now in the process of getting another, this one much more powerful than the first, in order to try it on my LS3/5A's. They are power hogs, and I want to try them with more power than is available from my Sugden A21a before I decide whether or not to sell them.
There are as many reasons for buying and selling equipment as there are buyers and sellers - isn't that obvious? The main reason I pursue this hobby is for the sheer FUN of it, and for the love of music. If that's not good enough for some, other pursuits are readily available.
Tim impresses me as an enabler, giving us the chance to listen to different amp designs without breaking the bank, and sharing the experience with those who are like minded.
I liked my Gaincard, but I LOVED my clone at a SMALL FRACTION OF THE PRICE!.
Regards to all...

I as many note, buy and sell on Agon for the ability to try a variety of equipment, I couldn't afford 10 years ago, but now can. I purchased a DIY Class A Jfet amp here on Agon, to see, before purchasing a First Watt J or Aleph 30 at the going price here on Agon. I believe a lot of folks try the excellent work of master DIY'er Rawsonte, ultimately buy the brand version and sell the DIY amp off to the next newbie to Class A SS. And on that goes, a pay it forward philosophy if you will. For now my DIY sounds great and will likely default to the secondary system once another First Watt Aleph J comes along for the primay stereo. All the best fellow Agoner's, I greatly enjoy this website.

great to hear such a passionate outpouring for these amps. In defense of the OP, knowing nothing of Rawson amps other then seeing them in ads, I too thought at times that there seemed to be many of them for sale.

It would seem that this thread was started as an observation looking for an explanation if there was one. I don't see the reason for so many personal attacks against the OP or questioning a supposed motive.