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 have a Prometheus TVC which is good, though I'm still smitten with my Shindo preamp so the passive TVC is only kept in reserve. It's very good, but not in the same class as the Shindo, IMHO.
Been using a Sonic Euphoria autoformer preamp for the last 8 or so years with excellent results although I did have compatibility issues with my EAR 834p phono preamp but other than that, have no urge to upgrade.
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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