Yes, you're right - wiring is similar in 564/565 (except speakerphone). However, part of modifications required for 1035 adjunct connection in BSP involve switchook wires on network which are soldered to the network in my 564, not screwed to the terminals. So modification will require to cut them out and solder new ones instead. It's painful to touch original wiring:) I even managed to get WE 185A network needed for adjunct, however not yet really modified the set.
Regarding German eBay stuff - let me know when you need smthg. I look also for a 551C shoebox with transformer removed to make it shippable (no sense to ship a 110V transformer which is probably half of 551C weight). So will more then welcome to use this service on both sides.
And really appreciate the mysterious 106A varistor spec, if you can find it.
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