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Some of his mods are good ideas, but there conflicting mods. As an example his change to the bright cap is fine, but then he makes a coupling cap smaller which will tend to make the amp thinner sounding.
Also his changes to the input stage cathode resistors will do nothing to increase the gain. Those resistors are bypassed with a capacitor, so AC gain is set by that. All he's done is increase current through the tube.
He's correct there was a ground loop, but his explanation is bull. The source of the hum is probably the lack of capacitance in the power supply more than anything else. "Two grounds equals no ground" utter nonsense.
He might want to read a book or two before he works on any more amps.
Did he change the power cord and remove the death cap?
 
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