Fender Groove Tubes - GT 6550 Duet Blue
Fender® / Groove® Tubes
All Fender® Tube Amps come Factory Equipped with Groove Tubes. They are much easier to replace (no re-biasing needed when replaced with color coded sets). They have improved harmonic balance, longer lifespan, matched gain to distortion ratio, plus a wider frequency response.
- Brand: Fender