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 realise 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