The top photo shows our mostly vintage repair bench.  We enjoy repairing vintage test equipment as much as repairing radios. On the extreme left of the photo is our trusty HP 8640B, the best RF signal generator available for servicing AM, FM and shortwave receivers.

The next photo is of our Western Electric KS-15750L1 tube tester made by Hickok, arguably the finest service-grade tube tester ever manufactured.

Here is an Atwater Kent Model 92, an eight-tube AM radio manufactured in 1932.  The cabinet is exceptionally attractive.

The oscilloscope shots that follow show a 1200 kHz AM signal reproduced by the radio.  The shots show how a radio signal is transformed in to an audio signal

1200 kHz signal at the antenna terminal. The signal consists of a carrier wave modulated by intelligence (sound)

The same signal at the grid of the mixer tube.  The signal gained some amplification passing through the antenna coil

Signal has been mixed with the local oscillator to create a 455 kHz signal, the intermediate frequency of this radio

Signal after passing through the second detector.  The carrier signal has been removed leaving only the audio signal

Final amplification stage of the signal readying it for the speaker coil and your ears

 Home