Tube Store or Tube Depot; I have always had good luck with the many tubes I have purchased from either of these companies them over the years.
Audio Research VT-100MKIII
I replaced the front end tubes about 3 years ago. The amplifier is starting to sound sluggish. I guess I need to replace the output tubes. Do you know anyone in the L.A. area that sells matched sets of tubes? I'm looking for top quality tubes. Price is secondary. I called ARC but they are to expensive. Any suggestions?