Yes, Singlepower ended in disaster, but my Extreme was the best sounding headphone amp I have ever owned. Unfortunately, Mikhail Rotenberg was started running a Ponzi scheme as his business went downhill. As with any Ponzi scheme, the biggest victims are the ones who got in last and they are the ones who are angriest.
But there are many Singlepower owners who have had their amps checked out by a qualified tech. Those amps can be purchased for cents on the dollar relative to what other tube headphone amp manufacturers are charging. And they sound extremely good.
But there are many Singlepower owners who have had their amps checked out by a qualified tech. Those amps can be purchased for cents on the dollar relative to what other tube headphone amp manufacturers are charging. And they sound extremely good.