How to Spot Super Rare 12AX7 Vacuum Tubes part I
13:31
Tube Lab #6 12AX7 Tube Rolling
1:08:14
How to identify unmarked vacuum tubes (European)
33:34
The Mullard story
25:27
Vacuum Tubes/Valves by Mullard ~Manufacture for Audio TV Radio
15:31
The EL34 Amp is Ready for Pre-Orders!
28:22
Vacuum Tube Output Transformer Measurements Determining Turns & Impedance Ratio & Matching To Tubes
6:16
Simple tests for Tubes with a Multi Meter
26:43