I have a pair.They are great.Get yourself 10 spare ribbons from Sequerra.Their power limit is 25 watts.
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Hi. If they are the ribbon tweeters that I think they are, they were very high end. A small box, slightly trapozoid type shape. Very heavy rare earth magnets.
I am pretty sure that they were used in The Mark Levinson stacked Quads/Decca London super system.
A friend of mine had some here in Perth, Western Australia in his Magnapan Tympani system. They were awesome.
There were several different models, I think that the T-9 was part of the MET 7 system and the T-1 was the original model. In my muddled mind there was a T-3 as well. The T-1s are a nice adjunct to the Quad 57s. Levinson used to sell the HQD system with Hartley 24" woofers, the Quad 57s, and the precursor to the T-1, the Decca ribbons.