yup that is definitely the place to look for help..perouse there all the time.
Nice find on the shorted cap, open resistor...
have you hooked up an external FM Antenna? I'm sure your aware these old radios really need one in order to work right. Not being familiar with European radios/tubes, one thing to investigate would be is if there is a tube in the front end that serves both bands? Like a converter tube.
Do you have a tube tester?
As an example in that Fada I posted about earlier, initially it played fine on AM but had no FM. Eventually I found two problems with it that were impacting FM operation.
One was the 12BE6 tube which is used as Both an AM and FM converter, quite often won't work on FM when they age, but will work fine on AM and might even test marginal in a tube tester. That 12BE6 tube just wasn't really designed for frequencies in the FM BC band, but that's what they had available at the time the earliest FM receivers were designed.
I also found a coil in the FM frontend circuit on the Gang Tuning Capacitor that wasn't soldered.
I'll keep studying your schematic..(doesn't help that it's German..LOL)
another thing is to gather up the tube data sheets for all the tubes in your set.
That may help you break it down to like a block diagram, so ya know where NOT to look.
Edit: I hope this helps ya dissect your schematic to a sort of block diagram to better understand
what's going on in each circuit. Each link has a nice description of each tube and what it was designed for, along with a datasheet. The datasheet can be useful when the operating voltages either aren't given, or aren't legible on the schematic / service info.
ECC85 - RF amp / FM oscillator / Mixer
EF89 - IF AMP (two of em)
ECH81 - AM Osc/Mixer/1st IF Amp
EABC80 - FM/AM detector
ECC82 - Audio amp
EL95 - Audio Power Amp (two in push pull)