This Bose® 901 Series II Active Equalizer, #96405, just came through the shop for the standard overhaul and a bit of an upgrade. It was suffering from the usual age-related issues, and had been worked on a bit in the past but was due for another job.

The electrolytic capacitors had been worked on in the past, but that repair was decades ago. Time to replace some parts:

To fit upgraded capacitors, the board needed to be drilled to fit the thicker leads.

Everything back in place, and soldered up with silver solder, this equalizer was ready to go home.