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Tested on my Dan Nelson Calibrated and Digitally Upgraded TV-7A/U.  This tester was first sent to Dan in 2020 during Covid to upgrade many of the components to new, also including the digital meter for more precise testing.  After 5 years, I sent it back to Dan in April 2025 for re-calibration, as after testing many thousands of tubes, I wanted to make sure it didn't degrade.  It was still nearly spot on, Dan mentioned, but he did a recalibration again, full cleaning, replaced all the sockets and a few other parts.  I'll send it back in 2030 again.  Dan's the man!

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48.9 / 51.1

Min = 32 / 32
NOS = 47 / 47