amplifier for large advents?

Maybe Hafler? Once upon a time a DH500 drove the heck out of a certain pair of Large Advents - they sort of make a "period pair". There are definitely others that worked (B&K, maybe Carver or Rotel, even Dynaco) so you really don't have to go at the level of Krell et. al.

My pair work nicely with a Rega Mira3. Also great with my Eagle 4.
You can take the Advents up a few notches by replacing internal wiring, connectors, crossover cap, etc. I have improved the already great bass with 4 front to back 1" maple crossbraces and changing out fiberglass insulation. enjoy.
P.S. Cardas Golden Cross speaker cables work great.. at 4 times the cost of the speaker lol!! Got 2 sets of Advents to play with, paid I think 150 or 200 for each pair.

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.

Mr_hosehead - thanks for the ideas. I had forgotten about Hafler. Those were pretty good in their day. I also forgot until you mentioned it that I have a pair of B&K mono amps in the attic. I'll try them first.

Xiekitchen - I was thinking the same thing. Have you replaced the connectors? What did you use? Does anyone do a crossover upgrade/rebuild service? Did you put the braces on the inside or outside?