I'll add my 2 cents worth also. I have owned many, many preamps, (and still own 2 phono stages) that use the 6DJ8/6922 tubes and enjoy them very much, but on the line stage side of the preamp, I really like what the 6H30 tube does.
The 6H30 still sounds like a tube, but has better bass control, more detail, (without sounding sterile or cold). It also provides a cleaner, crisper soundstage without being too solid state sounding.
I concure that they are almost bullet proof and last a VERY long time. Seems like preamps that use 6H30 tubes only use a few, unlike some others that use upwards of 10 or more tubes.
The 6H30 still sounds like a tube, but has better bass control, more detail, (without sounding sterile or cold). It also provides a cleaner, crisper soundstage without being too solid state sounding.
I concure that they are almost bullet proof and last a VERY long time. Seems like preamps that use 6H30 tubes only use a few, unlike some others that use upwards of 10 or more tubes.