[Hybrid tellies]

My Hacker Hunter RP38A is still full of lockfit transistors and has been working fine since I repaired it a few years ago. Its a joy to listen to.

Personally I have not had any problems with lockfit transistors but can appreciate a lot of people have both on tellies and audio equipment.
I think its down where the radio or TV has been stored over the years. If say its been in a damp garage, basement, shed then yes the lockfits have probably suffered long term water ingression. If stored in reasonably dry location they will probably be ok.

If your radio is working ok on all wavebands I would leave the lockfits in place.