Does the old gear stay old?

[HighHopes]

Hello all,

I am restoring some old tube radios and I and wondering if improvements should be made beyond the original equipment state. I am thinking of two upgrades.

One could put a phase-lock-loop under the chassis which would stop old sets from drifting. There would be nothing added to the front panel.

One could also swap out the envelop detector for a product detector to make for better SSB reception.

These improvements would be out-of-sight and out-of-mind. The set would just perform better and probably enjoy more use.

Any thoughts?