08-29-2018, 09:07 PM
Mid year change. IIRC, the tuner on the 121 is the same as the 1946 model and the tuner on the 122 is the same as the 1949 model. They are mounted differently. Also the 121 has the antenna coil on top of the chassis and the 122 does not. So in most (if not all respects) the 121 is identical to the ‘46 and the 122 is identical to the ‘49.