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what environment are you in? do you have single coil pickups on your guitar? single coil pickups will hum with just normal domestic household lights and this will cause a hum 60hz in the us 50hz in aus. if it isnnot that do what hypertonic said and make sure you have a common earth. if the amp is old i would also suggest that it is quite the possibility that there is a capacitor somewhere on the pcb that is old and warn and probably cracked which will need replacing. if this is the case your amp will also hum. similarly it could be a circuit board in one of your pedals but if the amp hums without your pedals then this isn't likely.
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