You better approach a philips dealer or service station. they do have the service manuals.
If you know them they can give a copy. or service at a charge.
meanwhile a publisher called BPB (business promotion beuro) had published at least 4 volumes or more for Philips and other makes. Try with them. They have a branch at many places like metros , other places like Hyderabad, Bangaluru etc.
Just to warn you, there might not even be a manual available - Philips pioneered the "non-repairable" radio, where they offered neither spares nor information.
You might want to try asking at the https://antiqueradios.com/ since there are lots of radio nuts there working on both tube and solid state radios. Some of those guys have schematics in their own libraries that they could scan for you.
There's a specific forum there to discuss solid state radios: https://antiqueradios.com/forums/viewforum.php?f=4
This radio was supposed to have been repaired earlier by a Philips service centre. So hopefully, it may not be one of those 'use and throw.' Hopefully, I'll get something on the web.
Just to warn you, there might not even be a manual available - Philips pioneered the "non-repairable" radio, where they offered neither spares nor information.
This model, Nigel, was also made in India and Philips service guys used to keep service manuals
earlier as a booklet for each , and later as a book form from M/s Philips India
I was regularly attending Philips models way back in 70s. i saw such volumes.
I do agree Philips pioneered use and throw models. Our latest TV sets are like that only from Philips.
One thing for sure, even TEA5713 might really pose a issue to replace, even if DIP as pin spacing is 0.05" or 1.77mm
This model, Nigel, was also made in India and Philips service guys used to keep service manuals
earlier as a booklet for each , and later as a book form from M/s Philips India
I was regularly attending Philips models way back in 70s. i saw such volumes.
I was presuming this radio was more modern than that, as it uses IC's - I can't remember when exactly Philips stopped spares and manuals for their radios, but I presume it was during the late 70's?.
I had manuals for radios pre-dating then, and repaired huge numbers of 'Pop Master' radios in the early 70's
you may be able to get enough information to troubleshoot the radio from the data sheets for the ICs. the data sheets often contain "reference designs" that are very close to what actually gets made.