I would go directly to Ralph Karsten with this question. There are a number of Atma-Sphere enthusiasts that also use VDH cartridges. I suspect this issue has come up before. Prior to my current cartridge I was using a Benz M0.9 that produced acceptable results without a transformer in my MP-1, but just barely. I currently use a cartridge with 0.25 output and a 5:1 transformer installed directly inside the MP-1 and I am extremely pleased with the results.
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