Quote Originally Posted by Francesco
I will soon be moving up a notch(!) to 12x20 and will be processing Efke PL 100 using BTZS tubes and Pyrocat HD. Any suggestions on adjustments to be made in developing times to those I use for 8x10?

Have you already purchased 12X20 BTZS tubes? If not I think it would be more practical, and cost you less also, to buy a used Beseler print drum and motor base. The BTZS tubes are wonderful for the smaller sizes but I found them fairly awkward to use in 7X17 and 12X20 size.