Vintage Western Electric 2a Phase Monitor. This is very hard to find and seems to be in very good condition for its age. The Western Electric 2A Phase Monitor is a device used in telecommunication systems. It was manufactured by Western Electric, a company that was once a major player in the telecommunications industry. The 2A Phase Monitor was primarily used in analog voice circuits to monitor the phase relationship between two signals. It was designed to detect and indicate any phase deviations or abnormalities in the signals, which could help identify issues such as line faults or improper connections. Some of the electronic part/s may continue for another 50 years without need of replacement and some electronic part/s may fail a few days after you start using the item. Out of a large collection of Vintage Tube, Solid State and rare electronics. Please visit our store as we get vintage electronics of tube, test, solid state, hifi, audio, etc Many great and rare items as well.