I have Focal Utopia headphones also and love them with a tube amp. I was using a Woo WA22 with the stock tubes but found I prefer the Ayon HA-3. I never tried the WA5-LE but it seems similar to the Ayon being a single ended triod with a separate power supply.
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Paul
Harbeth 40.3 XD, Sound Anchor stands w/ Stillpoints, Luxman M900 & C900, Aurender N20, Jay's Audio CDT3 - MK3 CD player, Mola Mola Tambaqui DAC, Shunyata Everest, Altaira
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