An old vacuum rectifier. Filament: 5 volts @ 4 amperes, Peak inverse plate voltage: 20,000 volts. This version has uranium glass seals around the pins. (Greenish glass ) Uranium glass is also known as “Vaseline glass”. It is made by adding uranium, usually in the form of uranium oxide diuranate to glass. Uranium glass will glow under ultra violet light. There were several types of table wear made with uranium glass in the early to mid 20th century, the most famous being Fiesta Wear.
The EIMAC 15R was used in the WW II era ASB-5 radar display unit.
First person to visit today