If all you did was unplug/replug the DIN/RCA cable then check that (have a spare?), and also check the new preamplifier.
You might also register here and ask for advice...
https://forum.beoworld.org/forums/
Regardless it should be a simple fix.
DeKay
You might also register here and ask for advice...
https://forum.beoworld.org/forums/
Regardless it should be a simple fix.
DeKay