[Amps] Rejuvenating glass power tubes

[Paul B. Peters, VE7AVV]

I've just acquired an SB-220. The amp has most of the standard
modifications -- but the 3-500s have not been in service for some time.
While the tubes are known to be good, I'm curious what you think might be
the best way to rejuvenate these glass power tubes?

73 de Paul, VE7AVV
StoneyGround Station
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