Hi Don,
Thank you ...
The problem arises on both inputs, same thing!
I also checked continuity between the two jacks and it was around 8 Ohm.
I used the 'Marker' switch too, dialed in the frequency and got S9 +20db on the scale.
The receiver works on the frequency shown in the display, I verified this when I received a faint broadcast station.
But basically the RX is really poor in picking up anything ...