Please recommend an amp for an ancient system?

I have ancient speakers, that I still love. My speakers are Raga Model 3's, my turntable is a Dual 505 and my CD player is a Marantz cc38ubl (to be upgraded soon). I've gone to listen to new speakers several times, but keep coming back to what I own. My needs are simple - I listen to classic rock and classical music in a 15' x 18' room. I need a new (to me) amp to power my Raga's. I'd like a recommendation on a DAC as well - the grandchildren have their I-things that they would like to plug in when they visit. My budget is $500. Thanks!