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The influence of powder geometry on the performance of tantalum electrolytic capacitors was investigated over a range of conditions. Two design normalizations were chosen to compare measurements with a transmission line model. To a first order approximation the results are as predicted by theory. Ano'malies appear in the behavior of capacitance and the equivalent series resistance (ESR) under extreme conditions. Powder geometry and anode size also give second order effects. The findings are useful in capacitor design.