Many years ago I rebuilt a handful of very old (circa 1870-75) Acoustic Control Corp. solid state guitar/bass amplifiers.
I had this same question. Yontz, at Mad Scientist Audio (? - been a long time) suggested using a light bulb current limiter, basically a light bulb socket spliced into a short extension cord with a 60 watt bulb.
NEW electrolytic caps AND old, discharged ones appreciate slow voltage build-up. Worked like a charm.
Lately though I use a 20 amp variac on recapping projects. ADCOM preamps, amps, tube amps, 1.5 kW HF linear amps, etc.
Curious to know what you do and how it works out for you.