This B&K 707 Tube Tester is a mutual conductance tester that has been restored and calibrated. The B&K 707 Tube Tester is good for overall tube testing. I like this tube tester because of the use of the many sockets for tube testing eliminating all of the selector switches that need to be set for the various tubes being tested. This tends to minimize setting errors.
When I was working with a TV repairmen, he used a B&K tester because they are so easy to set up to test a vacuum tube. We needed to get a good/bad quality check on a tube so we could quickly repair the TV. In those days we made house calls to repair TVs.
Because this is a Mutual Conductance tube tester, you get a better test of the tube’s quality.
Contact me if you have a tube tester you want calibrated.