Here is a quad of used 12au7 tubes. They were tested with a Marconi mu101/Hickok 533 calibrated mutual conductance tester.

Results are:

Tube#1 (Matsushita)

Triode#1

2200

Triode#2

2300

Tube#2 (unknown made in Canada)

Triode#1

2550

Triode#2

2550

Tube#3 (Hit-Ray Japan)

Triode#1

2600

Triode#2

2450

Tube#3 rca

Triode#1

2250

Triode#2

2300

No shorts

Minimum is 1385 and 100% is 2200.

Thanks for looking and please dont hesitate with any other questions!