This matches my experience.
I have a 103 that has been heavily reworked by Dom at Northwest Analogue - I'm using a Croft valve MC headamp with external PSU same as the one for the 25RS into the MM phono stage of the Croft 25RS - the results are "better" than any of the various SUT's I've tried. Sound character is very valve dependent IMO - I've settled on using Seimens CCa's in the headamp
Steve
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