Brett, The miniature equivalent of the 12SA7 is the 12BE6. Some characteristics may differ slightly, but I think it's as close as you'll find.
-Larry Brett Gazdzinski wrote: > If its not quiet, maybe I will try to duplicate the design of the > first receiver using a 7 or 9 pin tube in place of the 12SA7. > > I am sure there is a tube to replace the 12SA7 in a miniature > type.
