The best replacement for 6l6 is 6v6.

The best alternatives to 6l6 are rated as following:
★★★★★  6v6
★★★★  el34
★★★★  el84
★★★★  5881
★★★  kt66
★★  kt88
★★  6l6gc
★★  6550
★★  el34 tubes
★  6v6 tubes
★  kt66 tubes
★  kt77
  7581
  6ca7
  5881 tubes
  807
  el84 tubes
  12ax7
  el 34

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

Other search terms related to 6l6 and their ratings are:
★★★★★ kt66
★★★★★ 6v6
★★★★★ 6550
★★★★ el34
★★★ el84
★★ 5881
You have in mind a companion for 6l6 and it is not yet here? Propose!



Google Trends

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6l6
6v6
el34