If all bands are suffering from poor sensitivity, it could be a coupling
element such as a capacitor, relay, etc.
If it suddenly happened, the 1st mixer is probably the problem. These
receivers usually have a balanced dual JFET mixer. If that is the case, you
can replace those JFETs and that should take care of the problem.
It's too bad you aren't in this area..........I could take a look at it for
you.

Pete

"Volker Tonn" wrote in message
...
Pete KE9OA schrieb:

When I put it on my test bench, it could barely hear a 60% modulated 10uV
signal...........not good.


Seems to me I have a similar problem with my 525.
Lost about 20-30dB on sensitivity on all freqs (no VHF/UHF board
installed) :-(

I had a look on the scematics and thoutgt about the input stage amp
FET....?
Sadly I have no measuring equipment available other than a good digital
multimeter....
Greetings from Berlin/ Germany.

Volker