Hallicrafters TA-1 “TO Keyer” and a Surprise!

The keyer, as expected – in great condition, however, I will recap it and also test the tubes. And, look what followed me home: The surprise? A Central Electronics MM-2 “Multiphase RF Analyzer” – which is a 3″ CRT based oscilloscope. This model has the capability of monitoring both the KWS-1 transmitters waveforms as well as the 75A-4 received signals. The gray Vobroplex Bug,…