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.
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