If you have the owner's manual, see if it mentions this. There's a debate about whether you should put a tube in as a load when setting the line adjust. You only need to adjust the line voltage once per session, or unless you suspect that something may have significantly changed the line voltage (e.g. On most, you turn a switch to a position named something like LINE ADJUST, watch the needle on the meter, and turn a specified knob one way or the other until the needle lines up with a calibration mark. Line voltage adjusters vary depending on the machine. By using a consistent voltage, you get better apples-to-apples readings when you make tests. Most machines have some way to adjust for variances in the line voltage. Almost all tube testers use tubes themselves. If you have a manual, read it and follow its instructions. ![]() ![]() These are my opinions and observations, and a general guide to how testers work. This is not meant to replace a user manual.
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