Replacing an electrolytic in the power supply is hardly "recapping", it's
repair. "Recapping" is when someone feels they should replace all
the capacitors, or actually needs to replace a specific capacitor. And
then once you've done one, it often makes sense to do the whole lot,
especially if it requires a complicated disassembly. IN some cases capacitors
known to go bad over the decades were used, so it's worth
replacing all of them because they will go bad eventually, or enough
have gone bad that it's hard to get a handle on where the exact problem
lies, and replacing the capacitors gets that variable out of the way.

Fully agreed.

However the bare minumum one should do is to replace the paper capacitors
located on the high impedance points", that is the plate-to grid coupling
capacitors and those on the AGC line.

In my experience main problem of old paper caqpacitors is not the loss of
by-passing properties, but the birth of a non-negligible reeistance (1 to
several Mohms) in parallel with capacitance. In some cases such resistance does
not create problems (e.g. screen bypassing), but it does when the capacitor is
placed on a high impedance points.

73

Tony I0JX