Audio Development Co Filament Transformers - What to do?

My good friend Chris dropped these by my house a while back. Not just one very nice filament transformer but two. I went through the combinations of tubes I could light up with it and I got very distracted quickly...
6.3V   3.1A
6.3V   2.5A
6.3V   .45A
6.3V   .30A
5.0V   2.0A
5.0V   2.0A

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A Hi-Fi Primer Part 1 & 2 - 1956

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Retro Hi-Fi Girl Friday