Yeah, thanks John!
I "knew that" - but...
...anyhow that display makes perfect sense.
Worked on the #1 unit today - turned out the switch on the first Atten position was toasty.
It's a KAY, teflon "Mega Switch" (says so on the face of the panel bushing!). The same switch
used in those precision RF attenuators that have a bunch of toggle switches. Just like those units
someone put too much power on the input and smoked a resistor. But the switch showed open, after
a bit more checking and pulling the switch.
So, I drilled the rivets and decided to have a look inside.
neat switch!It's got a Teflon barrel with gold rings on each end that is permitted to roll from one end of the switch to the other on a gold plated track- then it bangs into the sides where there are some gold plated contacts that go through the wall (teflon).
On this switch the gold contacts were blasted where the contact was made.
So, since it is Teflon, I rotated the contacts in the body to find a clear gold surface and put the switch
back together with 2-56 hardware. Replaced the two dead 1% metal film resistors. 4 hours later... all good!
That's the short version.
Tomorrow we see if it "hears" now - it was stone cold deaf before! HA!
_-_-