You are privileged to be able to alternative between the two SET amplifiers, no doubt that both presentations are very enjoyable. I firmly believe that the individual 300b tube preference varies depending on the particular amplifier in use. For example the Western Electric reissue American tube is superb in some amplifiers. I didn’t care for it at all in my Coincident amplifier. In this amplifier the EML XLS is a much better match.
Charles,