The best replacement for avalon 737 is ua 610.

The best alternatives to avalon 737 are rated as following:
★★★★★  ua 610
★★★★★  ua 6176
★★★★  neve 1073
★★★  vintech x73
★★★  universal audio 6176
★★★  1073
★★  manley voxbox
★★  isa one
★★  universal audio
★★  ua 710
★  blue robbie
★  la 610
★  6176
  focusrite red
  universal audio 610
  api channel strip
  presonus eureka
  la 610 mk2

Your alternative for avalon 737 is not listed? Suggest!
Speaking about avalon 737, one probably shouldn't forget about u87.

Other search terms related to avalon 737 and their ratings are:
★★★★★ u87
★★★ neumann u87
You have in mind a companion for avalon 737 and it is not yet here? Propose!



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avalon 737
ua 610
ua 6176