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Rotary switch 5 way on the back of a Mark IV. Is there a replacement for this or a substitute? https://photos.app.goo.gl/nw1mPHWjfFEMCyrH6 Also wth is going on here? Tubes are fine. https://photos.app.goo.gl/GM5MTFT73C4uwvW98 Please answer if you know.

1: I'm thinking of putting JJ 6L6GC in my MKIV Rev A (aug '91). It arrived used with groove tubes. Can I expect it to be a safe change? 2: The V3 slot (labelled 12ax7 slot) doesn't like anything but a 12at7 it seems. Not that I'm complaining, it sounds good. If I put let's say a Tungsol 12ax7...

Is what I'm aiming for in my MKIV. Can you give me a few tips on your favorite tubes that is in that direction?

Mark IV. Anyone knows the name or number for the lead drive "lug"(?) The push-pull one. It's the one the qtip is pointing at. I'm assuming it's the D-shaft kind. It's driving me nuts cutting in and out. I'm in Sweden so I'm hesitant calling overseas. Could it be this one? If so is there a...