To recap or not to recap?

[horn man]

Hello all. I need some advice on what to do with an older amp, a Premier Multivox (I don't know the model, but the schem is listed on schematicheaven.com under Bargin Bin Amps, Premier-Multivox, model guitar? 1967). The amp sounds pretty good but from what I gather, should be putting out a healthy 11 watts or so from the 7591 power tube. I know its no where near that since it can be turned all the way up in my den without making anyone's ears bleed. (for comparison, an 18wt lite rattles the windows in the same room). My son's guitar teacher has the amp now and doesn't think the amp needs a cap job, maybe just a new power tube (its got the original Multivox branded power tube). He doesn't think its excessively noisey/humming at all. Further more, he thinks it has about as much volume as a Fender Champ from the same era. Now I have a lot of respect for him, as he is a very experienced player and has owned every guitar/amp rig imaginable through the years. But, I've heard modern 5wt amps, like the Epi Jr. head, and it is painfully loud in a small room when dimed. And, all the forums recommend replacing the caps on a 40 year old amp. So what's everyone's opinion? Replace the power supply electrolytic caps and the power tube, or am I expecting too much out of the amp?