The best replacement for kt66 is 6l6.

The best alternatives to kt66 are rated as following:
★★★★★  6l6
★★★  kt88
★★  el34
★★  kt77
★  6v6
★  5881
★  el84
★  6ca7
  6l6gc
  6550

Your alternative for kt66 is not listed? Suggest!
Speaking about kt66, one probably shouldn't forget about 6l6.

Other search terms related to kt66 and their ratings are:
★★★★★ 6l6
You have in mind a companion for kt66 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of kt66 in all years. Click on graph for more.
kt66
6l6
kt88