I use a Silver Rock Transformer Potentiometer, also own a Doshi Alaap V2.1 (which is an active preamp that uses transformer attenuation), and previously owned a Promitheus Signature TVC and a Music First TVC.
I only have the original grey MDF version, although it has been modified to have a selector switch and an added input (Serge would cringe if he read this). It's still better than any active preamp I have heard (when used in the right system), and clearly better than the MFA was (although at 2x the price).
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