The 6n1n-EB was produced in the 70s and 80s. It is original, and the pipe is a long-life, high-reliability, low-noise, ultra-durable pipe. The sound is very good, all-round soft, delicate, with a charm, long life, value, poisonous sound.Can Upgrade 6n1n/6P1 tubesPACKAGE2PCS 6n1n-EB Tube