Juan Antonio
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Agustín, not only certain tubes, cables are important here as well and its shielding: Good signal/power cords,... Your other devices are inducing hum to your CSP2 as well, specially if you aren't using good receptacles or filter/isolation transformer, etc to isolate it from the others. Also The problem I see here is that the CSP2 is not absolutely quiet like some people say. They say that it's completely quiet or very very quiet but I don't know if they are referring to a good quietness for a tube amp or.... What is dead quiet, for example, is my solid state SPL Phonitor headphone amp or any decent SS. It's just absolute silence. The CSP2 is just very little noisy when high impedance headphones are used. Just using for example 32 ohm Grado's are quite noticeable. As a preamp is less problematic. Headphones are more sensitive to hum. But even using it as a preamp is a bit noisy, specially when you turn the trim pots up. I even think that every single CSP2 is built a bit differently and unique. Some probably are a bit noisier than others.
Of course, what SS amps can't achieve is the incredible "music" that tube amps deliver. In general tubes are musically way better, warmer, richer, better timbral, etc.
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