Flat round and old ceramic disc capacitors

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I want to replace these with something better but don't know what to replace them with.
The numbers on them don't seem to relate to capacitance
at all so I'm baffled as to what values they are.
The ones I want to replace are about 30 years old.
Are there any sonic gains to be made by putting something
new or better in their place ?

Thanks

A
 
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