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@Well_is_it
Well, any electrolytic capacitors that old will most certainly just be dust by now which could be one cause of the crackling. Another likely factor is corrosion on a lot of the contacts and potentiometers.
If you think it's worth it, re-cap it and clean all the things! Or it might be worth looking at second hand amps, like NAD or something. Cheaper than fixing the old one for sure.
http://www.ebay.co.uk/itm/NAD-3020i-Stereo-Amplifier-/140909505268?pt=UK_AudioTVElectronics_HomeAudioHiFi_Amplifiers&hash=item20cedc6af4
As for speakers, tannoys from that era can be had for a steal in the usual place and sound on the right side of acceptable.
Otherwise, secondhand B&W 601s or something should be fine.