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I think you are correct...

Posted by marc g. on June 15, 2019 at 18:10:28:
...about where the shorting plug goes to reduce power, now that you mention it. I don't think using them requires any change in fuse value though. To clarify, I only commented about acres verde's shorting plugs since it speaks to reducing power, but doesn't require a fuse change as running fewer tubes does.

I may be worth it to verify with Ralph that the protocol for my particular MA-1s is the same as yours, since mine are considerably older.

Have fun with your experiments!