Now I know where the idea for plant pot drip trays came from.
Both bass drivers repaired and are working very well.
Both the mid range drivers had also suffered with age. The plastic outer suspension on both had come unattached from the paper diaphragm, mainly as a result of the glue going tacky, but also I suspect because it may have shrunk very slightly with age.
In order to reattach it I cut slots part way into the lip of the suspension to allow it to reach the diaphragm. I used superglue to stick it to the diaphragm, as this would activate and harden with the tacky glue.
I also did this on the other mid speaker and the diaphragms are now firmly attached and move smoothly over their limited travel.
The tweeters both seemed OK.
Put back together and tested they sounded nice. Speech was clear and rich toned, I thought music on Classic FM sounded very good with the orchestra coming through in crisp and rich tones.
Then I compared one with my Leak 2060 speakers and put the ITT speakers back in their original boxes.
p.s. It just goes to show you don't want to take it for granted that something is working correctly when it is described as NOS, unopened and still in the original boxes..
I was lucky and had the opportunity to see the speakers before I bought so I knew they were faulty.