I found a NOS Firestone, MADE IN USA, 30 X 3 tube.
Who knows how old it is, but I had forgotten it was under my back seat. It still has the original Schrader #35 valve stem which fits through a round felloe. I've mentioned this to Coker and Lucas many times over the years, and although sympathetic, they haven't ever done a thing. Why can't Schrader make this valve stem anymore? Has it been discontinued?
Larry, likely it has been discontinued, and with production of tubes gone off shore, they may not have access to the manufacturers anyway. Keep at the tyre manufacturers. You never know when they may just do something about their sub standard products.
Allan from down under.