It doesn't have the setup to be push pull so that would likely make it single ended. The 6L6 is a pentode power tube so that might make it a single ended pentode...
Just a guess since no schematics are available.
I would imagine low wattage as well, probably 10-15W output.
I agree with Joe, It looks like it is wired as a pentode. Watch the multi-section filter cap when you fire it up, if it hums or gets warm it needs to be replaced.