should be widely seen as the greatest of them all, a valve designed in , is just a little disappointing. so having spent a lot of time reviewing, and owning various single-ended (of course) b amps, i've decided my next quest is to chase up the alternatives, whether they are less well known 'classic' valves...
i/p converters flow & level what's new in flow & level variable area flow meters and rotameters air velocity indicators & wind tunnels electronic mass flow meters doppler/transit-time ultrasonics turbine and paddle wheel flow meter vortex shedding flow meters and pitot tubes magnetic flow meters valves...