The best replacement for power amp is preamp.

The best alternatives to power amp are rated as following:
★★★★★  preamp
★★★★  integrated amp
★★★  receiver
★  amp
★  preamp distortion
★  integrated
★  av receiver
★  powered mixer
★  amp head
★  mixzing
★  doubletwist
  solid state power amp
  beats audio
  player pro
  monoblock
  bass amp
  pre amp

Your alternative for power amp is not listed? Suggest!
Speaking about power amp, one probably shouldn't forget about axe fx.

Other search terms related to power amp and their ratings are:
★★★★★ axe fx
★ preamp
kemper
You have in mind a companion for power amp and it is not yet here? Propose!



Google Trends

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power amp
preamp
integrated amp