Is Singlepower still in bussiness?

You need to go to Head-fi.com and check out the "stickys" in the amp section. There is no reason for taking ALOT of peoples money and vanishing with it. Also, the amps he put out over the last couple years had serious (dangerous) problems.

It is a shame- he had a large following at hed-fi. Also Sadly I think he is out of it. My amp (an "Extreme") took almost a year to get. Fortunately it sounds great. Apparently it is not plagued with the construction problems, or inferior design issues, with the power supply.
He is a very smooth talker, who seems too nice to be a rip off artist. When I was having problems with delivery, I thought I was alone!

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.

Nope, SinglePower finally went down for good. Finally. There are of course those of us who know a thing or two around amps and are able to repair the units still out there. I would not recommend buying a "stock" unit that wasn't inspected and repaired, but the modified ones sound pretty nice.