Thank you all! These are some great suggestions. I'm going to definitely look into them, although $30k is a bit out of my range.
Meanwhile I popped in a Scott 222C and holy cow. I'm getting so much of what I want out of this amp (although admittedly the resolution isn't what it is with SET) even using the pre section instead of my Lamm. I know it's all about matching, so obviously something is clicking with the EL84s and my Diatones.
Fun hobby!
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It's somewhat of a coincidence this amp has come up in your thread. I was discussing it not too long ago with he who shall not be named (ddk!) and we both agree it is one of the greatest amps ever made. We each owned them back in the day.
Their main engineer was an interesting guy. He could build a radio, an amp or a bomb, your choice! (seriously- the guy worked on munitions for the Pentagon). How can you not love a guy like that! You have to wonder what he could do today with better and quieter components.
Marvin Hobbs, a B.S.E.E. and Ph.D. in Engineering Management, has retired from a long and distinguished career in the radio and electronics industry. Prior to joining Scott Radio Labs, he was a receiver design engineer for Zenith Radio, the Delco Radio Division of General Motors and E.K. Cole, Ltd. in England. In 1939, he became the Chief Engineer of Scott Radio Laboratories in Chicago, Illinois. Marvin served with the Radio and Radar Division of the War Production Board during World War II in 1942 and part of 1943. Afterward, he returned to Scott Radio until 1947. In 1947, he joined RCA and worked on its Berkshire program, followed by a role in 1950-1952 as Chief, Electronics Division, Munitions Board, the Pentagon. From 1952 until his retirement from Bell Telephone Laboratories in 1982, he held various technical and management positions in industry. Mr. Hobbs has done consulting on telecommunications and has written ten books on radio and electronics.