90921 Scope Amplifier - Sweep Unit

Those of us that are used to working with modern scopes don't often run into units such as the 90921. Millen manufactured, and still does, oscilloscopes in many different forms. Including those which were essentially just basic monitor scopes comprising power supply, cathode ray tubes and simple circuitry to adjust brilliancy and centering along with connections for the vertical and horizontal plates. This unit would provide the needed vertical and horizontal amplifiers and a saw-tooth generator to provide horizontal sweep. In many ways it is similar to the plug-ins used in more modern oscilloscopes.

The photo above is courtesy of Manuel Maseda W4SSB. This unit is owned by Rick Galardi, W1DEJ.

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