DuMont: Part Two – An Allen B Du Mont 224-A Restoration


Last weekend, I delved deeper into my restoration project of the Allen B Du Mont 224-A Oscilloscope, with the goal of finally getting it open, checking it for safety, and powering it on. The journey was filled with challenges, but ultimately, it was a successful one.

My first obstacle was removing the screws from the faceplate. While I managed to get many of them out, a few proved to be stubborn, and I ended up stripping them. Despite this setback, I pressed on, and after all the screws were removed, I was finally able to remove the heavy chassis from the housing.

Once I had the chassis exposed, I immediately got to work checking for any potential hazards. I used my trusty Fluke multimeter to test each capacitor I saw, and to my surprise, there were no shorts to be found. Feeling confident that the oscilloscope was safe, I then used cleaning sprays and WD-40 to give it a good cleaning.

Dumont 224-A Component Parts Location ‘Tube Map’

To help others who may be interested in restoring their own Allen B Du Mont 224-A, I’ve included a “Component Parts Location Map” that I will find useful during the restoration process.

With the oscilloscope looking and feeling safe, I finally powered it on. To my delight, it came to life without any issues, and after a few moments, I was finally able to see a sign of life on the CRT. The result was a clear signal trace produced by DuMont after years of being inactive.

The journey to restoring the Allen B Du Mont 224-A Oscilloscope will be a challenging but ultimately rewarding experience. I hope that sharing my journeys and the resources I used along the way will inspire others to take on their own restoration projects and revive these classic tools.

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