Walter, don't forget the military's definition of "portable": it has
handles. Most folks argue about the portability of a 555 or 556.
Still, the TM506, fully loaded, was a darned sight lighter and less
bulky than the six individual items of equipment that it replaced. I
always sat the TM504 or 506 on the bench with the 7K scope on top.
When I used the TM515, I had to build a 3/4" plywood "U" shaped box
to set over it to support the 7904 since the top of the TM515 wasn't
flat. And that's why I modified the TM515 to have a pull-push power
switch on the front panel. I didn't want to have to reach around
behind all that mess to find the switch.
Dean
