As an experiment, I built a 5 Watt amp based on a 6AQ5A tube, which is a miniature 6V6. It sounds great!

I don't get to use it much, because none of the guys I jam with has a decent PA set up. And they all want to wail with their Maximegawatt Earbleedinloudenboomer Mk XXVI amps. If I ever get off my duff and put another band together, we're [u]all[/u] gonna use itty-bitty amps like my 5 Watt WeeBeastie.

For your situation something like that would be just fine. In fact, if the speaker is efficient, you may find that 5 Watts is actually too loud. Due to the logarhythmic nature of our hearing sensitivity, a cranked 5 Watt amp is going to sound 1/2 as loud as a 50 Watt amp driving the same speaker! Something to think about, while you read through this thread.