07-10-2014, 09:23 AM
I think not only rectifier, but the whole tester is a big fat ersatz. Yet, I noticed that all big guys use TV-7, whatever brand it is, I 've bought some tubes with a sellers' stated good measurement on them and they all work fine, power tubes and otherwise. I also went through schematics of the mutual conductance testers, they have much more sophisticated layout, vacuum tubes, etc,whereas mine is as simple as they get.