ultron df91 - ultron dl92 combo:
a niece surprise as this is a nice and sweet sounding combo. the only thing i miss a little bit is texture in general and in the bass area especially, bass goes not as deep as with the dream set.
i would prefer this combo to the valvo df91 - valvo dl92 combo.
the main downside is that i was told that ultron just bought whatever was available only branding it with the ultron label, so could be like winning the jack pot or not.
nevertheless much better than the stock tubes.
ultron df91 - philips dl92 combo:
bass extension and texture are back, but the sound is somewhat unbalanced, bass a little soft, i prefer the ultron - ultron combo.
p.s. i worked through nearly 20 combinations of tubes now to as fast as possible give you my impressions, so hopefully this will be a first decision base for one or another of you to buy or not to buy some of the german tubes i wrote about.
only the telefunken 1u4 is waiting to listen to, but the major work is done.
i listened to all the tubes with my grado style headphone i posted a picture of before at medium impedance setting.
Edited by GermanGuy - 7/14/13 at 2:37am