While cleaning my MPU 100 I broke the capacitor at C5. (strange but it still boots). C5 is a radial tantalum 4.7 uF 25 V. I don't have any spares but I do have axial tantalum. I've heard stories about these things blowing up so I want to be sure I install it properly. It's not marked positive or negative. One end is tapered. The other end is square. Which is which.
IMG_3831 (resized).JPGIMG_3839 (resized).JPGThat would be a Kemet brand capacitor. It is marked with a "+" but isn't real clear about it. Rotate the part to find the voltage rating, the "+" sign is oriented towards the positive end.
Marking is even worse with the dipped type capacitors -- you have to look for the teeny-tiny "+" symbol near one leg. Often there is a stripe near the "+" symbol making it look like one big negative symbol.
Don't get these in backwards! Tantalums don't take nicely to that!
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Collinsville, IL