Converting Accuphase amps from 100v to 120v is not straightforward as the above discussion illustrates. You can never be sure that it was done correctly or to Accuphase standards ("you can use a 680Ω 3W resistor to replace fuse F1"). The above discussion does not inspire confidence, and these units could be a fire hazard.
Thanks for pointing it out! I should have been more specific.
You can use a 680Ω 3W resistor to replace fuse F1.
The vishay resistor that I recommended is a fusible resistor, it will blow out like a fuse in the event of a short circuit, protecting the circuit from damage and fire.
Fusible resistors are used as safety devices to prevent electrical fires and other damage caused by excessive current being applied at once. They can be found in household appliances like washing machines and microwaves, as well as electronic devices like stereos.
A fusible resistor performs dual functions. Once the power supply is exceeded, then it works like a resistor limiting current. Similarly, once the rating of power is exceeded, then it works as a fuse in the circuit to defend different components within the circuit from the surplus current.
Anyway, my intention is just to help those who have an Accuphase with Japan voltage and want to convert it to 120V or 220/240V, I don’t gain any financial interest from anyone.