GEC BC506 Non electrolytic capacitor question

[Mike Watterson]

It's possible the concern was the very low bias on the electrolytic at no signal rather than reversal as the bipolar ones work with millivolts and some of the electrolytics would go leaky without sufficient polarising voltage to maintain the oxide layer.

If we assume the transistor is never turned off then the capacitor voltage is about 110mV to 150mV, the Vbe of the transistor.