gem or trash..??

I have recently run across a Tube amplifier that has potential, but don't know much about it other than the following...
It has two massive transformers on top, as well as two 6L6 tubes, and two % something tubes, it also states that it is a 20 watt amp. On the front is a decal stating the name is ' Concert Master' thats about it, no controls of any sort, just some output connections and an input ... anyone have any idea what it is...??
I would appreciate any comments, or help... my Email is SG274@att.net
Thanks..