For sound more towards the warmer tube side of things, there was a pair of TAD Hibachi 125 monoblocks up for sale here the other day. I used to sell the Advents and have a pair of these and would like to hear them together.
For pure performance, a pair of 100 w/ch or so Class D amps would be another interesting choice. D-sonic might be a good place to look.
FWIW I still have my pair of OHM Ls (refurbed) that I bought back in the 70's when I sold both these and the Advents. OHM L was designed to have Advent sound in a smaller box and still have decent efficiency. These sound really good off my 500w/ch CLas D Bel Canto ref1000m monoblocks that I use to run these and other more demanding speakers, but are probably overkill for older Advents alone.
For pure performance, a pair of 100 w/ch or so Class D amps would be another interesting choice. D-sonic might be a good place to look.
FWIW I still have my pair of OHM Ls (refurbed) that I bought back in the 70's when I sold both these and the Advents. OHM L was designed to have Advent sound in a smaller box and still have decent efficiency. These sound really good off my 500w/ch CLas D Bel Canto ref1000m monoblocks that I use to run these and other more demanding speakers, but are probably overkill for older Advents alone.