Hi guys...final update (from me!) on the 'smoked' Mullard ST CV1052.
After well over 100hrs' burn-in, and weeks of living with this tube (2 as drivers, 2 as powers), I can safely say that it has surprised me more than any other tube to date - including the magnificent mesh-plate EL11s driving the equally magnificent TFK EL12 Spezials.
But before final conclusions, I must repeat that with these particular EL tubes especially, any less time will
not show them to their best...and significantly less will
not give truly meaningful results (especially in a highly resolving setup - including top flight headphones lol!).
I never thought I'd come across a tube with the clarity and treble mastery of the C3g, which surpasses any 6SN7 you care to name. But this tube (C3g) can soon sound a bit too harsh in many systems, and for some ears. However, this Mullard can match the C3g for treble detail and extension, but without said possible unfortunate trait...instead, with a refined sweetness that isn't at all 'syrupy'.
It also reproduces mids far better, and a bass that surpasses (IMHO) the mighty ECC31 and FDD20...again seldom matched by any 6SN7. It does so in pure detail and sheer impact which, in combination with the supreme mids handling, give a fullness of sound that I have not seen equaled by any other combination I've tried over the years.
Related to this is a quality that I hadn't fully grasped until living with this tube a good while - ie. its deftness in keeping all this extra detail - across the entire frequency range - under precise control, even when crescendoing to loud climaxes. This wonderful dynamics handling was highlighted to me when I revisited favourite test tracks that had loud passages where I would normally have to reduce the volume somewhat. Unless due to poor recording, most times I now have no such need...with no loss whatsoever in 'slam' from such passages.
I now realise that this feat is made possible by the tube's mastery at detail separation and positioning, which it maintains at loud volumes, rather than everything merging in a less controlled way. Once again, no other previous combo has been able to do this with such precision and aplomb....all the while its 3D holographic soundstage remaining intact - a very hard thing to achieve IMO.
Needless to say, I simply cannot believe this tube (driving the same powers, at least!) performs to such a degree in an amp not specifically configured for it. And that it does so with the quietest background ever would also indicate no internal amp conflict whatsoever...(along with running the amp hardly even warm to the touch).
And so I can only recommend folks to
try and look out for these
smoked glass, Mullard military ST (shoulder-type/'coke bottle') CV1052. Perhaps they might just surface now and again...I can only hope so lol!
And I personally would recommend them as drivers driving the same as powers...CHEERS!...CJ