[Steve McDonald]

The 10-12 features "Electronamic" tests. It is actually an emission tester, but it's a darn good one. I have a 10-12. I've never been able to find documentation of the calibration process, or anything from the factory, so I've never messed with it, but it tracks well with my CALIBRATED Hickok testers. I use a TV-7 to check tubes. I even have a spare TV-7. I have around 30 testers, most of them Hickoks or military testers. If you can find one, replace the 5Y3 with a 6087.