Universal 01A / 201A Triode Vacuum Tube – Preamp Grade

Universal 01A / 201A / 301A/ 4600 Triode Vacuum Tube Universal Fit for Classic Vacuum Tube Gear Step into a world of pure analog sound with this premium O1A triode vacuum tube—interchangeable with over 40 designations, including 201A, 301A, CX201A, VT-30, and more. Whether you're restoring a rare 1920s radio or building a period-correct tube preamp, this versatile replacement fits a wide range of vintage audio equipment. With its UX4 base and authentic triode design, it’s fully compatible with legendary models from Atwater Kent to RCA. Legendary Warmth for Audiophile Preamp Applications Renowned for its smooth, linear response and low microphonics, this O1A-style tube excels in high-end preamp stages. The tube’s refined internal construction ensures excellent voltage amplification with minimal distortion, making it ideal for audiophile-grade tube amps and signal chains. Expect rich mids, soft highs, and the signature warmth only a true triode vacuum tube can deliver. Collectible Quality, Restorer Approved This is more than just a vacuum tube—it's a piece of audio history. Whether labeled as CV750, 401A_UX, RH201A, or LB-201A, each variant shares the same core legacy of clarity and character. Perfect for vintage collectors, antique restorers, and builders of historically accurate gear, this tube redefines timeless performance. Add it to your inventory and keep the past sounding beautiful. Includes: 1 TUBE Inquire if you're looking for specific tube brands which are 20% premium.