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Original service lit advised not soldering on the foil side of the board unless necessary. It advised to crush the original part on top of the board and solder the replacement to the lead stubs of the crushed original.
They are not service friendly as a first resto, and if HV is gone it can be a royal pain to diagnose.
I had one of these as a first tube set. After months of screwing with it I set it aside for ~10 years till I had done enough easier (and comparably hard) sets to be able to do it for sure. I had a parts set and a original still sort of working on original caps....Did all three in the course of a couple of weeks.
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