@MrPeeBeeDeeBee: Perfect example of why the pursuit high-fidelity aka hi-fi no longer exists.... I found the 'edge' irritating.
@MarcelNL: In this video I prefer the gentle sound of the second tube, in the previous two I preferred the more airy and detailed sound of the first one. Bit more emphasis on and energy in the treble. (Quickly browsing through it at first, will check the whole videos when I don't have a noisy toddler in the room.)
David Mellor is CEO and Course Director of Audio Masterclass. David has designed courses in audio education and training since 1986 and is the publisher and principal writer of Adventures In Audio.
@MarcelNL: In this video I prefer the gentle sound of the second tube, in the previous two I preferred the more airy and detailed sound of the first one. Bit more emphasis on and energy in the treble. (Quickly browsing through it at first, will check the whole videos when I don't have a noisy toddler in the room.)
@MarcelNL: You're on a roll! :-)