Experience unparalleled precision and performance with the GM & Plate Current Matched Quad (4) Genalex Gold Lion Reissue KT88 / 6550 Vacuum Tubes. Each tube in this meticulously matched quad undergoes rigorous testing to ensure consistent GM (transconductance) and Plate Current, guaranteeing optimal functionality and reliability. Crafted with precision engineering and attention to detail, these tubes deliver a rich, dynamic tone with exceptional clarity and depth. Whether you're a dedicated guitarist or an audiophile seeking pristine sound quality, immerse yourself in the warm, vintage tones of analog audio. Elevate your sound experience to new heights with the GM & Plate Current Matched Quad (4) Genalex Gold Lion Reissue KT88 / 6550 Vacuum Tubes.