Ruby 6550 Guitar Amplifier Power Tubes - Matched Quad Set POS Only Authentic reproduction of the circuitry

Authentic reproduction of the circuitry from the "Modular 55" Series

Strong and secure leather ends

Chrome die-cast tuners deliver stable tuning performance and long-term reliability

Built-in 10 x 2 channel USB computer audio Interface

Ruby 6550 Guitar Amplifier Power Tubes - Matched Quad Set POS Only Authentic reproduction of the circuitryA refined update of the GE6550 with a rugged, straight bottle. All Ruby power tubes are matches using the Magic Parts matching procedure, and the plate current and transconductance matching measurements are labeled on the base of the tube. By matching these measurements, your amplifier's performance and life span is optimized.