I'd like a databased file library. It would be searchable by topology and tube type. It could be a very simple database. Submitters would itemize the tubes and if it was an SE, PP or OTL amp. For example, if I wanted to look for all circuits using a 12HL7, I could just type that tube type in and see all the circuits that are available. I could further refine my search by selecting only SE amps. This would be a great learning tool.