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Yes, that is the original circuit. The modifications are even wierder with two additional volume controls, two speaker outputs some kind of selector switch to choose between four different inputs etc.
The design seems very strange to me as well and it was not what I expected to find. Maybe it's easier to get new stuff altogether. A tweed princeton seems like a project with the right level of difficulty.
I might not give up on this one entierly because just maybe the transformers might be useful.
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