Thanks for checking! I have 3 2N5088s on all 3 right now. I tried a few different replacements today. All 3 of a different type and also 1 different among 2 remaining 2N5088s.
2N2924 2SC1815 did not work at all. Went quiet. With dimed pedal and guitar, some faint fuzz could be noticed.
2N3904 works, but can’t say it’s any big difference.
2N2222A was perhaps a bit treblier and grittier but very hard to tell. Some noise had me confused, but after packing up I realized it was my desktop computer and a lamp.
Will see if there is anything S9013 compatible I can find if not the same.