Ah… nice, thanks for sharing!
After your first reply, I got myself a copy of the service manual and had a good look at the schematic and I did spot how the 220V and 120V were wired differently. But the picture of your BG5500’s transformer wiring clearly renders the schematic into something real. Hah… now I truly understand, or do I ? 🙂
Assuming the transformer is correctly re-wired from 220V to 120V, is there anything else that would need to be rewired before the turntable can be plugged in using a simple plug adapter ?