6550 (KT88) Shu Guang vs Telefunken vs Vintage JAN Tung Sol Vacuum Tubes in Dynaco Mark III
21:22
Tung Sol KT120: Why do some of them overheat and others don't?
17:18
British Sound EL34 vs American Sound KT88
25:27
Vacuum Tubes/Valves by Mullard ~Manufacture for Audio TV Radio
34:35
Dynaco Mark III - MK 3 - Restoration Part 2 - BG069
14:32
Can I Build It In 10 Minutes? The Dynaco VTA ST-70 Amp Kit
18:15
Do power tubes make ANY difference?? KT88 vs 6L6 comparison
15:22
NOS 6550 & KT88 Tubes Intro - TungSol, GEC, GE, Sylvania for McIntosh MC275, Aegis tube amp
25:21