I have not had much experiance with the 5881 series of tubes. I have used only KT88/6550-EL34-807's..on and on, but my new incoming amp has the 5881's (Onix p3).
The only 5881's I heard were Sovtek's so I can't judge. However, somewhere I read that your amp would take 6l6gc's. If that is so I would recommend the SED 6l6gc. Its a great tube, especially thru the mid range.
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