Hi all,
good news - my QMX is up now and we have clean signals on 80/60/40.
Only on 30/20 is something faulty.
First I thought the LPF is on bad condition but measurements (DMM in diode-test-mode) from anode D510 through L510/L513 and reverse from anode D513) shows, that the route is ok.
The only idea I have at the moment is, that somethings wrong with Q511.
Any helpfull hints welcome :-)
Frank