That is devastating news, I'm scunnered. I'm late in posting,just saw his name out of the corner of my eye.
Patrick helped me out with amp builds via email. He was a typical Ozzie, forthright but immensely kind hearted. I emailed him out of the blue, he responded straight away in his inimical style. His site is an invaluable resource for valve amp builders, I have some articles copied, but not all, after his site crashed a year or so back, but I'm missing some schematics etc. Best go and save the lot.
What a sad loss for the valve amp building community. Look up any arcane valve amp subject and you'll find old forum posts made by Patrick from years ago. I didn't agree with all he wrote, all engineers and designers get stuck on favourite methods or ideas even if they're not 100% correct and his prose can be a little hard to follow sometimes, but he certainly delved very deep into valve amp design.
Fair play to Patrick, he shared his knowledge and his passions, I shall miss him even though I didn't know him well. Condolences to his family and friends.
Andy.