A few years back I had James Burgess build me a 2a3 amp .. To mention a few of the parts were the James transformers.. the bigger ones.. that are squarish in shape (better bass) --not the typical round ones that are often used which cost less. . Some high end silver and oil caps, ,etc. choked p.s. etc. My bill came to just under $2k. Some of you may have heard of Mr Burgess.. His creations come up infrequently. He was able to deliver the amp to me because he visits the bay area at times. However, I no longer have the amp as I sold it to lighten the load for a move I made out of the bay area. It simply should not of been sold especially considering how good the build was and how good it sounded. James is a jeweler at his day job and does this as well.. Oh, I almost forgot. Design was based on the Baby Ongaku.. I forget who designed that but the article of that amp is online. I forgot also James’s name.. Had to search through email. Bette Davis said getting old is not for sissies. I feel like a sissy more and more. lol. btw--I dont have James’s contact info any more because... no,, I might have his phone should anyone be interested. He’s in southern Cali and probably can be located online as well. btw--good for the poster who sussed out what drivers were used. Seas much better of course than some of this stuff that passes for drivers. In addition -- I have quite a sensitivity to hum issues concerning tube amps.. Operational hum,,coming from the amp itself not the type of hum that can come through the speakers.. The operational hum when its there can happen for a number of reasons. Almost every tube amp I have had both P/P and SET had issues with hum.. The Burgess 2A3 had no issues with hum.. and as for tube rush--the minimum if any at all. That's quite a build!