The best replacement for 5881 is el34.

The best alternatives to 5881 are rated as following:
★★★★★  el34
★★★★  6v6
★★★  6550
★★★  kt66
★★★  6l6
★★  el84
★★  6l6gb
★★  6l6wgb
★  kt77
★  6l6gc
★  6l6wgc
★  jj 6l6
★  kt88

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Speaking about 5881, one probably shouldn't forget about 6l6.

Other search terms related to 5881 and their ratings are:
★★★★★ 6l6
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5881
el34
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