Recent advance in high voltage electron microscope has entailed an expanded application of a continuous observation of non-static structures in specimens at elevated temperature or under stress. In order to attain this end, the need for a VTR system capable of recording structural changes is increasingly felt. Through several investigations, we eventually decided to adopt an Image Orthicon tube, as pick-up tube, considering its high recording speed, reliability and ease of operation.In this paper, a detectable speed of the specimen depending upon the specified resolution, electron beam flux and size of the specimen is experimentally discussed by adjusting the gain of the amplifier so as to obtain an optimal condition. The TV system consists of a high-gain Image Orthicon tube and a transformer circuit which has a band width of 8MHz and a frame speed of 1/30 sec, as shown in Fig. 1.
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