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In Tech School back in the 1960's, we had about 20 Dumont Oscilloscopes and one Tektronix 545A. The 545A was then state of the art and very expensive - and the instructor got to use it more than the students. The Dumont scopes did not have calibrated time bases.
Other than it being a curiosity, they are not worth much because you can purchase a sophisticated Tektronix or HP scope for very reasonable prices.
Carl
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CW
1950 Zenith Porthole - "Lincoln"
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