How To Spot a Rare Genalex or Gold Lion Vacuum Tube

Genalex and Gold Lion are regarded as some of the best British tubes (or valves) ever to be made in the U.K. These tubes have been reproduced, and without knowledge of what the 1950s and 1960s tubes looked like, you can spend a large sum on a later Russian version, or even a deliberate fake. Learn how to recognize the real NOS tubes in this short video. The rare 12AX7, KT66, and KT88 types are shown, among others.