This is a B&K 707 Mutual Conductance Tube Tester that was calibrated. The B&K 707 is a good Tube Tester for overall tube testing. One of the nice things about
B&K Tube Testers
This is a B&K 707 Mutual Conductance Tube Tester that was calibrated. The B&K 707 is a good Tube Tester for overall tube testing. One of the nice things about