Electro-Harmonix 6550

Superior high-power Octal Beam Tetrode, suitable for any amp using 6550 or KT88. Designed to hold up in even the most punishing environment of high powered bass amps, such as Ampeg SVT.

• Thanks to extra headroom, bass players can realize the full dynamic and tonal range of the instrument
• Nickel steel side rod mica supports sweet tone regardless of setup, even in combos where the tube is only inches from the speaker