Didn't know that, Graham. Great shame, as all their cart's, from Aria through Phoenix to Orpheus & Proteus were/are superb exemplars of transparency. Wonder why they've gone, as the son, I believe, took over (in the Proteus) in a similar way to Sugano of Koetsu.
Afraid not Mike. The owner/designer passed away over 18 months ago and he was the only one who built these cartridges. The brand is no more which is a massive shame.