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I imagine you ought to be alright pairing a 102B with your athenas as long as you don't listen to your system loudly, don't need substantial bass depth and/or authority, and don't listen to complex music.
Really, if I were you I would try to save up and get the 302 or 502, or maybe one of the hybrids if you're not dead set on an all-tube design. You'll get more power, bass weight, and versatility with compatible speakers.
Just my opinion; like you, I only took my plunge into tubes a little over a year ago. Good news is that I'm VERY satisfied with my decision.