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Yes a failed transformer was a surprise for me. In some of his videos he goes to extraordinary lengths to repair stuff of modest value, including dismantling fiddly multi-gang switches which I assume he can't find replacement parts.
I would agree, he also takes on a broad range of equipment, although I do like Mr Carlson's lab for the valve/tube stuff and Curious Marc for the old HP instrumentation, the obscure and US and Russian* space related stuff.