The Rudistor portable looks to be several years behind current portable amp SOA.  It has the features and kind of looks like my HeadAmp AE-2.   
 
The real amusing part of this page is that at the top, Rudistor makes this statement in an attempt to differentiate this amp from other portables: 
   
"Although it shows a traditional external design under his solid magnesium body it hide ..." 
 
while down below in the proviso stating that blue is the only available customer: 
 
  "Due to designer decision the XJ03 ( as well as all the new portable products ) is available only  in electric blu anodized aluminum body, with engraved graphics and silver color panels." 
 
What happened to the magnesium body?