Recapping of SS amplifier

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Gooday all,
I am about to recap a SS amp. I am going to replace all the electrolytic capacitors. It has got a couple of Mylar and polystyrene caps as well. Must I replace them as well, or must I leave them be ? The amp is about 30 years old.
Thanks for any info.
:)
 
The polystyrene caps will be fine. The mylars should also be OK.

If there are any electrolytic capacitors in the signal path, it may be worth looking at whether they can be replaced by modern day film parts, but i would not go overboard on an amp thats 30 years old. If you are in doubt here, just replace - modern electrolytics will be of much better quality anyway.
 
Thanks for the reply's,
I sometimes get some scratching on the one channel when the amp gets hot , but it is not there when it is cold. I have measured about 112mv dc on the faulty channel when the fault occurs. So I'm first going to change the electrolytics and see, if it happens again, then I'll take it from there. Thanks again.
 
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