New Old Stock in original or white boxes. The rarest rectifier I have ever found, equivalent to the 5U4GB.
Tubular shape with huge brown bases, triple mica, heavy heatproof glass, the works. Will replace any 5U4 type as
long as your chassis has a full 2 inches across the socket for the over sized base, or you can use socket savers.
Great military tube. I have one in my Chinese integrated, it was the most cost effective upgrade I made.
My last 7 are up for sale at $75 each, you will not see these again!