Hey all! I recently got a Heathkit TC-3 tube checker. The checker has a scrolling list of tubes and the settings. Unfortunately, this doesn't cover every tube. I have however found supplementary data sheets for the Heathkit TC-1, TC-2 and some other charts for other Heathkit radios. These have a much larger list of tubes and the settings. My question is, are these settings the same on most testers? Can I use the same settings for my tester to test those tubes? Will the letter switches do the same for the TC-3 as the TC-1 and even IT-17, IT-21, and IT-3117? Is there a difference between tube checkers and tube testers? If so what? Thanks in advance.