Small valve rectifier with a thoriated tungsten filament which consists of a cylindrical glass tube with cylindrical metal pieces inside; the bottom of the tube is capped with black plastic and has a metal screw attachment (similar to a light bulb); the top of the tube has a cylindrical metal rod c…
Small valve rectifier with a thoriated tungsten filament which consists of a cylindrical glass tube with cylindrical metal pieces inside; the bottom of the tube is capped with black plastic and has a metal screw attachment (similar to a light bulb); the top of the tube has a cylindrical metal rod coming out of it.