Even 5 watts tube is loud but with a good Pre PI(ala JCM800) master volume it would be good for practice. Maybe look for a Blackstar amp they should be plenty cheap or anything low wattage JCM800 based. Another suggestion for practice I would say set your JCM800 NMV or an old Fender Bassman to a low level volumewise and get a Friedman BEOD, I think it would be great for practicing at low volumes and your would not have to buy another amp.