This Bose® 901 Active Equalizer, Series VI, came into the shop recently. These are some of the most recently produced Active Equalizers, although they’re still potentially a few decades old at this point in time. This is only the second Series VI that’s come in for repairs to Rain City Audio. The owner reported it was intermittently crackling after playing for a while.
After all new caps and new op-amp chips, this one sounds great!