Hi John;
You don't want to know how much that little nye viking tone unit cost new.
It was well over $100.00. I found that that at the time it worked much
better than anything else available. At the time I was using a manual tuner
and tuning both the radio and amplifier and it worked quite well. I hold
onto the thing just because it seems more sensitive than the tone from the
cw swr meter.
73
Rich