I have had two tries at getting an EC-TL. The first was sold as a EC-TL but what was delivered was just an EC and it turned out the helicoid also had a problem in that the tab for stopping down the lens was broken. It did have a nice split image focus screen in it though.
This is the second attempt and it was bundled with lenses and a second helicoid.
Clearly a EC-TL and the meter lights up but it is extremely non-linear. It goes from over to underexposure with minimal changes. Thanks to Jimmy Koh I have the calibration procedure. It is complex as you adjust the electronics of the meter itself and then the shutter LED display is adjusted independently. I *think* I can try to calibrate the meter by using my shutter tester and measuring the shutter timing in 'Auto' mode while calibrating the electronics of the meter. That is roughly what it sounds like the factory tester for the EC-TL did. I need to verify shutter timing first though. This is all assuming the meter is just badly out of calibration and doesn't have a failed component in it.
If that doesn't work I can return it all. Was interested in this bundle for the 100mm but the 75 PC I might hang onto as well. Already have the 50mm though.