I purchased Altec "Voice of the Theater" A7 speakers in the mid 70's and drive them with a 100+ watt per channel GAS Ampzilla power amp for my home stereo.

I'm looking to upgrade to tube technology amps and wonder what I should do with the Altecs. They still sound great, but I've been out of touch with audiophile stuff for many years so I need help.

How do these compare to modern speakers?
What would be a logical step up?
What would the step up prices be?

Jack