Intact Audio AVC DIY Autoformers Dave Slagle's Passive pre

This is a audiophile passive preamplifier self built based on Intact Audio AVC (Autoformers). These autoformers are winded by Dave Slagle and are the base of the actual Bent audio preamplifiers. If you dont know these just google to discover these autoformers compete with the best in class. In fact at this price they are a steal. This is a dual mono realization 23 steps with the following attenuations (0, -3, -6, -9, -12, -14, -16, -18, -20, -22, -24, -26, -28, -30, -32, -34, -36, -39, -42, -45, -48, -52dB).

Apart from the autoformers that costs 425USD all parts are audiophile: Cardas RCA, Jupiter silver wire in silk for signal, Elma vintage replicas volume knobs, high quality ground switch (yes you can choose between grounded or lifted ground). The case is massive weight with front panel of 7mm.
Unfortunately being of soft aluminium some scratches are visible on one side (see picture). This unit can be used everywhere being a full passive realization. Passives based on AVC or TVC are marginally impacted by impedance roll off or general impedance issues that afflict resistore based passives. A transformer based passive trade off voltage for current and this offers an incrising current al low volumes. Being a private sales a warranty cannot be given but you have my personal word it works perfectly.
This is an AVC which some people believe connect you more directly to music compared to TVC. If you dont mind i stop description and kindly ask you to google especially on Intact audio page or Bent audio where they also explain the quality of this autoformers. You could also find an interview where they are favourably compared to S&B transformers, actually the reference product in transformer based passive.
Feel free to ask any question you might have.

Cost of shipping are high as this unit is heavv