Supreme Tube Board for Blues Jr

  We have upgraded the Fromel Tube PCB Mod for Blues Jr: See description below for details. With over 100 boards sold I made some slight revisions. You cherish your Blues Jr, and now it's time to take it to new heights. The Fromel Tube PCB is the solution to maximize your amp's performance, regardless of its version, from Made in USA to the cathode biased IV.Experience a profound improvement in tone, feel, and noise reduction with the new Tube PCB Mod. We've fine-tuned every detail to deliver excellent performance.Mods from Stock:A cathode follower driven tone stack creates a smooth, compressive vintage feel. The stock Blues Jr leaves one of the gain stages in V2 unused, we use this for the cathode follower. The tone stack loads the signal down a lot, the cathode follower helps recover that signal while adding some musical compression.  Cathode biased for a touch responsive playing experience. Prior to the current version of the IV all Blues Jr’s were fixed bias and run hot if not modi