[John Caswell]

Hi Dave
First things first,
As this set uses "U" series valves it is bound to be a "live" chassis ie the chassis is connected to the power line and depending which way around the power plug is wired it could be at 240Vac with respect to earth, so BEWARE! Do not connect any signal generator/oscilloscope or what have you directly to the chassis, that way lies a nasty surprise.
If you have/can obtain a 1:1 230Vac isolating transformer of suitable rating, say 100VA, then the situation changes in that as the set is now isolated from the power line you can earth the chassis with impunity. BTW a variac is NOT an isolation transformer. If you cannot get hold of an isolating TX then couple the signal generator to the set with a couple of turns of wire at the end of your generator lead, although from the look of it you can plug the generator into the aerial sockets, but check the isolating capacitors c303/4 are OK first - just in case one is s/c.
As this set looks to be German in origin quite often they would put suitable markings on the scale for RF alignment - I know Grundig always did, and usually there is a mark on the scale for where the pointer should be set at the low frequency end
As the original coverage was 88-100MHz then at a guess the lower alignment point will be around 89-90MHz and the upper alignment point 98-99MHz so try 89MHz and 99MHz
So... at 89MHZ initially adjust Tr303 and at 99MHZ c309, repeating for best results always finishing at 99MHz with c309 so that the scale pointer matches the scale calibration. Check across the scale at various frequencies for reasonable accuracy.
Once this has been done then at 89MHz adjust Tr302/Sp301 for max signal and at 99MHz C305/C316 repeating for best results and finishing once again at the 99MHZ. Do not touch Sp302/303 at all unless this has been tweaked/got at.
Hope this helps bit

John