I took apart an old NWS weather radio. I suppose it was from pre-IC days, so there's a million components I can use (pots, switches, diodes, resistors of every value, inductors, 16 MHz crystal, tunable inductors!). The [electrolytic] capacitors have a different marking system than nowadays. Instead of having the actual marking (220nF, 10V; for example) on them, they just say: "47/10 47/10" and so on. Does this mean 47 microF @ 10 V?
Does this mean 47 microF @ 10 V?
Yes. Generally if a cap has polarity markings they are electrolytic capacitors that are almost always in microF units.
Careful though. Pre-Historic ( I mean pre-IC days) electrolytic capacitors are probably close to end of life. There's some liquid magic inside those guys that might not be there anymore.
Unlike wine, electrolytic capacitors seldom get better with age.
I just hooked up a 3V DC supply to one of the caps for about 10 seconds, and my multimeter read 2.5V! Not to bad!