Re: Another dead Roberts RT22.
4u7 is indeed 4.7 microfarads. This is a common value, readily available from all component suppliers. Which capacitors, other than C18 & 19, do you feel need replacing? BC328 & 338 transistors are common easily available types, but other transistors in the audio amplifier may also have failed. As Graham says, you need to do some fault-finding, preferably with the aid of the service sheet, which costs £1.99 and helps to fund the forum. You also need to be able to understand circuit diagrams, and interpret the radings you get with a multimeter.
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