I've contemplated the same substitution but haven't been able to pull the $600 NOS trigger! The person I bought the Art 2 from tried the DR's and felt they weren't worth the $$$$$. Jayfox felt it was "minimal' in his BAT 31 SE, Elberoth2 seconded the statement "The claims of major differences with 6H30 tubes are way overrated". Granted everyone has different gear CJ, BAT and AR but all are experienced audiophiles with the same conclusion. I'm not sure how to test the 6H30P on my tester or I'd buy a cheaper used quad just to scratch the itch.
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