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A great example of how a minimalist circuit can work well. I have not built this CRO as I prefer symmetrical drive to the deflection plates to prevent trapezium distortion. Another advantage of such a simple circuit is that it will drive several different types of CRT's eg 902, 2AP1 etc. You may need to add a focus pot for the 2AP1. The OTK 13lO1i is a 1 inch tube but will also require a focus pot CRTGIRL100
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