The best replacement for kt77 is 6l6.

The best alternatives to kt77 are rated as following:
★★★★★  6l6
★★★★  kt66
★★★  e34l
★★★  el34
★★★  kt88
★★  6ca7
★★  6550
★★  el34l
★  5881
★  6l6gc
★  gold lion
  jj kt77
  el 34

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kt77
6l6
kt66