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I've had a metal base GZ34 (the best gz34), a Sophia 274b, and EML 274 solid plate in both 6SEs at my current disposal..=
I'd say the GZ34 and EML are at logical extremes... the GZ34 is incredibly tight, punchy, bright, and intimate/closed in. Using it with say a 6de7 is pretty crazy. The EML has huge soundstage and imaging, much warmer and looser, but even complementing it w/ a 6ew7 it still doesn't 'thud out' down low. It still rocks well. They would be a personal preference and perhaps synergy w/ cans and source. The GZ34 is just too much for me in the Woo (a regular mullard will be more relaxed), although I love it in the Sonett. The Sophia splits the difference but is closer to the EML. I do like this tube, but sway to the EML because overall it brings me closest to a speaker-like presentation.