We are always on the look out for good vintage electronics. While it is not a major staple of the work we do from time to time we are fortunate to uncover a nice vintage piece to offer our customers. We'll do our best to give you an accurate description of the item along with plenty of pictures to assist in your decision making. Prior to listing the condition will be accessed to the best of our ability, but we encourage you to please submit any questions you may have prior to making your purchase.

We have a very simple Knight 400A Tube Checker. It test for shorts and emission. It does not test for any other characteristics, it does however give a reliable warning of tube wear out. We will not list a tube that has a known short, and when able to we will provide the emission test result. Most that we have test in excess of 90%.

Condition: Tube is in Excellent Condition. The Emission Test Value is NA%, no short. No original box .

View our other Vacuum Tubes