300B

The JJ 300B is a modern replacement for all standard 300B applications. These tubes have the classic DHT mid-range that we’ve all fallen in love with, along with an extended bass response and a more muscular overall character.

We’ve pushed the JJ 300B to their limits (and beyond) and we’re amazed at their performance and longevity.

After manufacturing these tubes go through an extensive stabilization and burn-in process. They’re individually numbered, matched, and shipped with a factory test sheet.

After a 24 hour burn in all power tubes are tested for noise and matched at multiple operating points for plate current (± one milliamp) and transconductance. Please leave us a note in the comments section as to what amp they’re going into and or if you’re looking for a specific grade.