I am working various amplifiers in my labs. On nearly all of these amplifers (CC, CE, or CB), the input signal is capacative coupled. However, the cricuit schematic indicates the use of a polarized capacitor. The capacitors I am using are rated at a maximum voltage of 50V. Most of the voltage levels I am using never exceed 30Vrms. When the current reverses polarity, is it still possible that it could damage the capaictor? Why the use of electrolytics? I have seen this on the power amplification portion of a superheterodyne AM/FM radio I built as well (That is, the use of electrolytic capacitors).