Expanding questions about tubes in a preamp

Geoff, it's marone. Or were you calling him a deep red person?

Whatever is the most cutting. 🤗

Hi,
wolf_garcia,
how do you explain same tube being microphonic on gain stage and not on the driver stage?  Same pre no tricks, no dampers used. Same quiet scenario in the more sensitive phono stage. It was a CCa 1962 pair brand new. Did i throw away the tube? No, used it, enjoyed it and after 2000hrs sold it to a new happy owner and the tube is running quiet and strong as new. Why i sold it? I am done with NOS tubes, just kept 60 of them after being struck with NOSphilia and having owned 552, a small fortune. That was an example and i have similar findings with other NOS tubes having  microphonic tendencies in the phono stage and being quiet in the line stage. Dampers do work in cases and it is not paranoia, but just a way to solve an issue. Just tossing a tube does not help.

ieales,
"A with tube damper testing is it is impossible to install / adjust them without moving the tube and refreshing contacts"
you can surely adjust the position of the damper on the glass if you use something that can roll on the glass while a tube is working (with gloves of course).
The way i put it is you may or not hear a differene but is far from anecdotal.
I agree with you that any chassis damping will have positive results for resonance control especially in areas like focus and bass quality.

Skeptics say anecdotal, audiophiles say empirical. 

geoffkait :
I enjoy your post very much and over the past couple of years have learned a lot from them.  But, you have a nasty demeanor.  Why is it acceptable to verbally assault others?