Hi Clive,

Marco, those capacitors are old and as suggested could do with replacing. Bear in mind that sometimes putting really good capacitors works fantastically but at other times said capacitors whilst having the same capacitance as the originals will be quite different in their ESR (resistance). This can change crossover points and possibly phase - but nothing that will damage anything. Having given that warning I'd suggest some ClarityCap MR.
Thanks for that, and noted

However, I'm unsure if the crossovers in my pair are identical. One would certainly presume so, although they will most certainly be of a similar vintage.

Can anyone work out the cap values from the pic - or does anyone have a circuit diagram, or know from experience what they are?

Clarity Cap MRs are what I used in the crossovers of my Monitor Golds, so I know how good they are, and those are the ones I will use if I decide to tweak the Celestions.

The thing is though, they sound amazing as they are and seemingly don't lack any clarity, nor do they have a rather tubby old-fashioned sound (quite the opposite!), like the MGs did before I upgraded their existing crossovers....

I can also say that about my 15XRs, which are entirely original and sound simply wonderful for their size.

Perhaps Celestion were simply very good at matching the right capacitors to their drive units, sonically in terms of voicing them, regardless of if they are the best available now, bearing in mind that their speakers in those days were built from scratch from the ground up as entirely their own designs?

Sometimes with these things you just hit upon the right recipe and get the 'seasoning' spot on.

It's a difficult one to judge whether it's worth the risk (and expense, as CC MRs ain't cheap) of f*cking them up when they sound quite wonderful as they are now..............

All sensible suggestions, though, will be gratefully received!

Marco.