How to Test a 6BG6 Tube on the Eico 628 Tube Tester (Step-by-Step Demo)

Summary: This video shows a full 6BG6 emission test using an IO tube tester. It covers the line-adjust process, scroll-based settings, tube insertion, and the final merit and shorts check. Why This Matters: Correct configuration ensures that older tubes are evaluated consistently within the tester’s capabilities. The procedure also highlights the additional plate-cap connection required for certain tube types. Content covered in the video: • Verifying meter zero and setting the tester to line-adjust. • Locating 6BG6 settings on the scroll and interpreting shunt, filament, and switch data. • Adjusting the shunt to 21 and setting the filament to 6.3 volts. • Selector-switch position and the required up and down switch configuration. • Inserting the octal tube and attaching the plate cap. • Warm-up period and observation of filament glow. • Performing the merit and shorts test and noting the tester’s limitations.