The triple is more like 125-130 watts RMS really.
The triple has 6 6L6s and 3 5U4 rectifier tubes. I think you have 1 5U4 to rectify every 2 output tubes. So a dual rectifier only has 4 output tubes.
The output tubes you use can vary. Usually 6L6s (standard) or EL34s.
Singles have 1 rectifier and 2 output.
Duals have 2 rectifiers and 4 output.
Triples have 3 rectifiers and 6 output.
I've had a dual channel chrome chassis triple for years and I love it. I've ever only seen ONE other chrome chassis triple for sale since then. It should be super rare one day.