The D7/201GH is a small oscilloscope cathode ray tube. Brimar in the 1960s were a leading maker of oscilloscope tubes. We do not as yet have operating details but the D7/200GH is very similar and will be a close approximation to this tube.The B13B all glass base has the evacuation seal in the centre. The pins can be seen to be composite with the red platinum section having a coefficient of expansion that matched that of the hard glass base.The neck of the tube is semi-frosted and this gives a blurred image of the electrostatic gun assembly.The screen is rectangular and shows signs of phosphor burn. Burns occur when a non varying image is in place for a protracted period or if the image is produced at high intensity.The end window envelope is 61 mm X 55 mm. The tube neck is 33 mm in diameter, and excluding the base pins is 170 mm long.Reference: Observation. |
Updated August 12, 2016.
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