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The quality of the electron beam in electron diffraction tube S is affected by the resistance between sockets C5 (cathode) and F4 (heating filament) on the tube. For optimum results, the resistance needs to be 390 kOhm. Tube holder S is accordingly designed such that this resistance is present. Older designs feature a much smaller resistance and need to be modified in order to work with the S-series electron deflection tube 1013889.
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