Grannyring,
If by tube dampers you mean flexible rings that can be rolled down over the tubes to quiet vibrations due to heat and signal then, yes, I do use them with both the preamplifier and the DAC. I was surprised to hear that the rings do improve the music slightly.
I use the Siemens ECC tubes provided by Joseph as an upgrade. I bought the rings that I am using on Audiogon. There may be more sophisticated materials available. I have not tried others.
Rand
If by tube dampers you mean flexible rings that can be rolled down over the tubes to quiet vibrations due to heat and signal then, yes, I do use them with both the preamplifier and the DAC. I was surprised to hear that the rings do improve the music slightly.
I use the Siemens ECC tubes provided by Joseph as an upgrade. I bought the rings that I am using on Audiogon. There may be more sophisticated materials available. I have not tried others.
Rand