New old stock Amperex 19AU4GTA vacuum tube.  Half-wave rectifier / damper diode.  Made in USA.

Shipping can be combined with my other tubes, sockets, and parts for sale on my ebay store, $0.50 for each additional miniature, $1 for each additional octal.  Add to cart then request invoice.
While stock is available, I will attempt to meet brand or sub-type requests that do not require detailed inspection.  Some types have additional stock available.

International shipping can be expensive, starting at over $50 in many cases.