Voltage conversion of Accuphase E-650

Hello, I would like to request advice regarding changing the voltage of Accuphase A75 from its Japanese 100V model to 230V. While I have experience with voltage conversions, this is my first time working on an A75 model, so your assistance is greatly appreciated.

The basic modification plan involves rewiring the main transformer wires in parallel, replacing the fuse with an 8A slow-blow fuse, and changing the relay jumpers from J1 and J3 to J2. I intend to include circuit photos for reference. I have already measured the resistance allocation of the main transformer wires using an LCR meter.

https://drive.google.com/drive/folders/1jEZNpgb04ZSw6yBU3Tum0yNrq4RdXZ6P?usp=sharing

1. Orange - 120V Red - 100V Grey - 0V

2. Yellow - 120V Brown - 100V White - 0V

To achieve 230V, I believe I need to connect Orange to Grey and Yellow together in parallel, leaving White as it is. If you have any advice or suggestions, please share them. Thank you!!

@imhififan 

Just confirming that for the E-470, switching the voltage from 100V to 120V requires only moving the connectors from K3 to K5 and K4 to K6, with no change to the jumpers J1 and J3.

https://ibb.co/4fT3dys

https://ibb.co/WWfHVj6

@dbxdx5 

Yes, switch the voltage from 100V to 120V, leave jumpers J1 and J3 unchanged.

Thanks for confirming. Do you tweak the bias after doing a voltage conversion?

@dbxdx5 

While it is not necessary to bias the power amplifier after voltage conversion, I thought it would be a good idea to record the rail and bias voltages before conversion for future reference.