[Arran]

The early "Baby Grand" line of sets sound muddy, in part because of the solid spider they used in the pie pan speakers, when they are reconed, or the original spider substituted with one of the 45 RPM adapters style spiders they usually sound much better. With regard to the detector, it might be worth an experiment substituting a S.S signal diode, or Schottky diode, for the plate detector, though most of us we usually have multiple choices of radio to listen to as a daily driver. I've also heard of some people swapping tubes, but that usually involves changing sockets, and I would not want to do this with a radio in good original condition.
Regards
Arran