calorgas
Generic middle-aged man
You can buy passive preamps cheaply that will work really well with the 606, or you could make one yourself if you can wield a soldering iron - I successfully made one so it can't be that difficult .
As others have said, any speakers will be fine. The 606 has plenty of power (140 wpc?) but can still be used with speakers with lower power handling as long as you don't get carried away with the volume.
As others have said, any speakers will be fine. The 606 has plenty of power (140 wpc?) but can still be used with speakers with lower power handling as long as you don't get carried away with the volume.