This is the transmitter Steve Hemphill built. It's a Phasitron design, which is a slight anachronism -- Armstrong never saw a Phasitron -- but it's still choice with a reasonable historicity (not to mention being actually constructible, which might well be a challenge for an even older design).
Copyright 2005, Garrett Wollman. All rights reserved. Photograph taken 2005-06-11.