Adapter for electron diffraction tube D (U19171) for connection of the heater voltage via safety experiment leads. Includes internal protective circuitry to protect the heating filament against excess voltage. Dimensions match the three-pole connector for the tube.
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for experiments with electron tubes of the D series, 1000644 [U191051], Electron Tubes D](/thumblibrary/U191051/U191051_01_140_140_Helmholtz-Coils-D-for-experiments-with-electron-tubes-of-the-D-series.jpg)
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