Perceived change in tone between 50w and 100w is higher in EL34's than 6L6's.
Reference: Stiletto with 50/100w switching capability, and DC-10 with 60/100w switching capability.
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In my experience, less EL-34s sound better, and more 6L6s sound better. That's why I run my Stiletto in 50w mode, and why the Triple is my favorite Recto for metal.