How to Test a 6BG6 Tube on the Eico 628 Tube Tester (Step-by-Step Demo)
Published at : 23 Dec 2025
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.