How to identify unmarked vacuum tubes (European)
27:07
How A Tube Works
59:39
Intro to Vacuum Tube (Valve) Testers
19:37
Adam Savage's Vacuum Tube Collection Gets CT Scanned!
20:52
Guitar Amp Vacuum Tubes Part 1: Triodes and Tetrodes
14:41
LASER Headlamp for Cars?!? How strong is its laser? | Find out how it works and how to power it up
23:31
Vacuum Tubes: Episode 5 – The Pentode
42:20
Which Tube Tester Is Right For You ???
32:58