My Quad 22 died in a flood. I mourn it, but in truth the wax potting had destroyed the wiring years ago. Rebuilds are "my grandfathers axe" and replace everything except your rusty Quad nameplate and the chassis. Re-making transformers is labour intense and KT-66 are very expensive.

I have a Sony discrete component bookshelf amp with slider volumes for L and R which I love, but it has never quite been the same since a cat we were house-sitting pee'd on it in the 80s. Some things don't mix with electricity. I had one power transistor replaced after that, but the volume L/R got out of whack. Now, it blows the safety fuse when I power it on, and I suspect it needs work, which may well head to "my grandfathers axe" in discrete componentry again.