Can   a noise bridge which was once used on an old heath kit
HW-12 be used in conjunction with an antenna tuner for reading SWR?
I will try and describe it.
It has a switch on the lower front which slides back and forth to the left
or right for turning on or off and a flat roguery knob next to the
switch.  The connectors for antenna and so on are on the top.  It also has
a round raised speaker.
I would also like to know what to look for, when it comes to the power
supply hum, when the rig is loaded up for maximum out put.

Thanks all:
Michael