Pye / Radiola 9137
I was asked to look at a model with the Radiola label (France) in our free walk-in café-repair.
As your page said it's a relabelled Philips. The jockey wheels and brake rubbers(?) have turned to sticky glue and the apparent consensus on the web is that Philips models aren't worth spending time on. I could read a tape but there's no rewind and a few other mechanical faults.
An earlier Philips model 4408 (late 60's) works OK; I isolated the electronics and put in a battery-powered preamp for playback-only. So it's best not to assume that all old Philips recorders can't be recuperated.
Ther was a circuit diagram taped inside the 9137.