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Reduction of size and weight in electronic type transformers to keep pace with miniaturization in other phases of electronic component designing has led directly to higher temperature operation. Temperatures in the region of 185Â°C require inorganic materials throughout, including where used, the dielectric coolant. Design details and materials performance in "miniaturized" electronic type transformers are discussed in this paper. Specific Class A transformers are redesigned using these new techniques, thus giving size comparison.