Korpa 
Exhibits many of the same characteristics as the EL34, but with a power output of roughly 5-8 watts. Very creamy and smooth; used in many modern class “A” amps. Nearly every modern tube amp company produces a small amp, and Groove Tubes EL84s are a perfect upgrade for any stock tube in these amps. Great for recording and rehearsal; with a soft and tactile touch, rich harmonic response and pleasingly musical top end.
The warmest Groove Tube in this family. It remains very buttery, with relatively high power output and very even response. A great replacement for many modern stock amps, overcoming a variety of design issues and limitations in inexpensive tube amps. A great way to upgrade your amp and step up to Groove Tubes tone with one of our best sellers.
Single EL84-S tube rated from power range 1-10. Each tube has a specific rating (i.e. R2, R7, etc.) and is biased to a specific output level.
R1-R3 = Low:
- Early distortion, wide range, softer attack good for Rock and Blues solos.
R4-R7 = Medium:
- Normal performance, great dynamic range/attack and best all around rating type for all styles of playing
R8-R10 = High:
- Most dynamic range, most clean power/less break-up for power players, Jazz and bass amps.
