HJ, thanks for linking to filmdev.org. What an excellent site.
Matt, thanks for your detailed help and your views on stand development. I agree, I wish to learn how to get consistent results with a simple formula before moving on.
So 6ml per roll would correspond to Dilution D 1:39 on the Covington site, then. And that would mean about 25,75ml for my tank. But here I hit a little snag - the MDC only has Tri-X at ISO250 for Dil D at 9min at 22C. I've shot my rolls at 400. True, there's not a huge difference between 250 and 400 and I could probably tweak it after having scanned the negs. But if I want to get it "right", approximately what time should I use?
Thanks again for your help