I would like to mention as far as rectifiers go the 5ar4 is the best
Most rugged rectifier choice why ? for one it is very rugged long lasting ,also
And this is the most important ,it has a irdirect heater which slowly
Brings up the current for roughly 10 seconds which extends the life of the tube snd other rectifier tubes several donot which creates an on rush which taxes the supply capacitors. N.O.S Mullard and Amperex
Are he best ever made and possibly the last one you will buy for your amplifier.