The best replacement for ac30 is twin reverb.

The best alternatives to ac30 are rated as following:
★★★★★  twin reverb
★★★★★  ac15
★★★★★  deluxe reverb
★★★  ac30vr
★★★  ac50
★★  jtm45
★★  ad30
★★  bassman
★★  hot rod deluxe
★★  bluesbreaker
★  night train
★  fender twin reverb
★  dual terror
★  hot rod deville
★  ac 15
★  blues deluxe
★  dc30
★  classic rock
★  peavey classic 30
★  fender hot rod
★  dc 30
  matchless dc30
  fender deluxe reverb
  ac40
  fender bassman
  super reverb
  laney vc30
  orange ad30
  fender deville
  classic 30
  ac30cc
  salomon tornado

Your alternative for ac30 is not listed? Suggest!
Speaking about ac30, one probably shouldn't forget about attenuator.

Other search terms related to ac30 and their ratings are:
★★★★★ attenuator
★★ treble booster
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