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2,665 Posts
Always an exception...

Just FYI, the 12AU7 doesn't like to just be plugged into a 12AX7 socket.

It works after a fashion but unlike the other tubes mentioned it doesn't like the usual 100k plate resistor value. It would rather see maybe 47k or even less.

So by just plugging it in you aren't really giving it a fair shake. If you like it ok but if you don't it may be because it needs the resistor changed.
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