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 this tube tester is the use of many sockets for tube testing eliminating all of the selector switches that need to be set for the various tubes being tested using one socket. This tends to minimize setting errors.
B&K 707 Mutual Conductance Tube Tester
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This is my current go-to-tester. I acquired this tube tester from a Customer and it has been calibrated and several enhancements added. This is a very clean tube tester and