Tubes

How are the Shuguang 845 C from Upscale audio? Are these better than Chinese Electron 845 that come standard on many amps? What about compared to PSVANE and other brands? Anyone with experience ? 

Tube World has great carefully selected tubes. Not the lowest prices but quality is high.

Just received a pair of Linlai Elite 6sn7 tubes for my tube DAC.  Excellent sounding tubes.  I bought these after hearing some top end 300B power tubes in my nephew's amp.  Those were stunning and even beat out the Western Electric reproduction tubes that were supposed to replicate the originals.  Linlai seems to be doing a great job producing some if the great tubes of the past.

I own hundreds of vintage tubes.  It is a game of 30 to 50 percent rejects when you take into account testing and real world performance.  Just because a tube tests at 100% does not mean it will perform well.  Heaters may draw to much.  The tube may be extremely microphonic.  A quote from Tung Sol is the best way to test a tube is in the system for which it is intended.  If new tubes from EH and others are available you are best to go that route with The Tube Store, Tube Depot, or Antique Tube Supply.