The best replacement for kt88 is el34.

The best alternatives to kt88 are rated as following:
★★★★★  el34
★★★★★  6550
★★★★  6l6
★★★  kt66
★★★  kt90
★★  300b
★★  kt120
★  el84
★  kt77
★  el34 tubes
★  6l6gc
★  5881
★  6550 tube
★  kt100
  6v6
  gu50
  845
  6550 tubes
  6c33

Your alternative for kt88 is not listed? Suggest!
Speaking about kt88, one probably shouldn't forget about el34.

Other search terms related to kt88 and their ratings are:
★★★★★ el34
★★★ 6550
You have in mind a companion for kt88 and it is not yet here? Propose!



Google Trends

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kt88
el34
6550