NOS OD3A Raytheon USA Cryo voltage regulator tube
This is a genuine new-old-stock Raytheon JAN (Joint Army Navy) OD3A, which is a military grade version of the OD3 voltage regulator tube. Made in USA in 1984. It has been cryo-treated, which extends tube life by about 5 times. This tube has the original box and is in mint condition.