KT88-TK Vacuum Tube, Matched Quad

The KT88-TK Vacuum Tube, Matched Quad is a premium set of four big-bottle power tubes selected for balanced operation in compatible amplifiers. Manufactured in partnership with JJ Electronic in Slovakia, these tubes deliver strong output, an expanded low end, and a rich, harmonically dense tonal character.

Each tube undergoes rigorous testing, cryogenic treatment, and an extensive burn-in process for consistent, dependable performance across the matched set. The quartet is suited to KT88 amplifier upgrades and many amplifiers using 6550 tubes, though compatibility and bias requirements should be confirmed with the equipment manufacturer or a qualified technician.