The best replacement for attenuator is overdrive pedal.

The best alternatives to attenuator are rated as following:
★★★★★  overdrive pedal
★★★★★  master volume
★★★★  power scaling
★★★★  potentiometer
★★★  volume pedal
★★★  ppimv
★★  pedal
★★  iso cab
★★  volume box
★★  dummy load
★  variac
★  silencer
★  volume control
  isolation cabinet
  vvr
  hot plate
  rockcrusher

Your alternative for attenuator is not listed? Suggest!
Speaking about attenuator, one probably shouldn't forget about marshall class 5.

Other search terms related to attenuator and their ratings are:
★★★★★ marshall class 5
★★ twin reverb
★ ac30
★ bassman
★ 6505
You have in mind a companion for attenuator and it is not yet here? Propose!



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attenuator
overdrive pedal
master volume