06/16/2023
So this is a vacuum radio tube! These are the tubes used in the tube tester shown previously. The general purpose is to be used for signal amplification as well as current rectification. These can burn out over time and is worth using a variac the first time you fire up a dusty tube radio. This will help restrict the voltage so as to not blow a tube. They can be obscure to find which can slow the restoration. The coding on the side is very important denoting voltage, company model number and the number of pieces inside. Not all have each and every prong on the bottom. There is a small bump “key” on the bottom of the circle. To count your pins you must go clockwise from this set point. Now you know!
#1940 #1930