The Riccardo Kron 5U4G is known to be in the very top tier of 5U4G rectifiers, this sample was used for approximately 1 year in my Allnic H3000, then stored since. (I swapped to RCM Theriaa mkii). So this tube is low hours and mint, and I believe unavailable to buy now. It was by far the best tube I tried, as many others will agree. These are rare on the used market, especially low hours as new..

Will ship worldwide, but buyer covers the costs.